[Open-Box] M21 Pro – 6in Plate, 21mm Throw, 1000W

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SKU: O-M21 Pro
  • The M21 Pro random orbital polisher covers more area faster with its 21mm long throw and 6in backing plate
  • Provides even distribution of any compound, polish, or sealant
  • The best option for tackling large vehicles with dual action
  • Start the polisher slowly or use a custom reduced speed with the progressive trigger 
  • Maintain comfort over long periods of time with the trigger lock feature

Original price was: $229.99.Current price is: $183.99.

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Prestigious M21 Pro Dual Action Polisher

Random Orbital Polisher
Best Results with Extensive Coverage

The random orbital polisher is a needed addition to your detailing arsenal.  Loved by professionals, the M21 Pro saves time and energy on large detailing projects, unleashing your vehicle’s brilliance. Crafted with a 21mm throw and 1000W of power, it has been engineered to deliver outstanding performance. It eradicates paint imperfections, leaving behind a mirror-like finish that will make heads turn and set new standards in the industry. The M21 Pro dual action polisher is the professional’s choice for achieving stunning results and elevating your craft.

M21 Pro Dual Action Polisher

Features and Benefits

The Best Dual Action Polisher for Large Area Polishing

The powerful motor with a long throw of 21mm delivers precise correction while covering extensive areas. Effortlessly erase swirl marks and scratches and achieve a flawless, professional grade finish.

MaxShine M21 Pro Random Orbital Polisher, polishing, white and polish pad

Accessible Speed Range for Advanced Correction

Elevate your car detailing experience with the adjustable 2,200-5000 OPM speeds and a variable speed trigger. A wide range is provided so you can best match the speed to your correction needs. 

Speed Change test

MaxShine M21 Pro is Balanced to Perfection

Unbeatable paint correction and superior polishing results stem from the perfectly balanced electro-mechanical engineering of the M21 Pro’s internal components. Less vibration from a random orbital polisher allowing seamless job flow, resulting in high productivity.

MaxShine M21 Pro Random Orbital Polisher - Car Polisher

Durable and Resilient Design

Striving for excellence MaxShine’s M21 Pro is developed with a high-quality steel CNC machined counterweight and NSK bearing to further extend the life of the dual action polisher. 

Comfortable Grip for Extended Use

Whether you prefer the rubberized horn grip or the adjustable and detachable D-handle, MaxShine has designed the M21 Pro for your convenience. Polish longer without pain or fatigue.

Random Orbital Polisher M21 Pro Ergonomic Comfortable Grip
M21 Pro

Advanced Features of the Random Orbital Polisher

The Best 21mm Dual Action Polisher

MaxShine M21 Pro Random Orbital Polisher DA Durable, built for years

Designed for Durability

The high-quality steel CNC machined counterweight is crafted to endure over time, even with heavy use.
MaxShine M21 Pro Random Orbital Polisher Speed Consistency is Key

Polisher Speed Efficiency

Keep a constant speed and maintain precision with the trigger locking function and 6-speed controller setting.
D-Handle Mount MaxShine M21 Pro Random Orbital Polisher

D-Handle Mount Option

Optimize your comfort with the adjustable handle. Achieve matchless grip satisfaction and better control.

What's in the Box?

MaxShine M21 Pro Random Orbital Polisher
MaxShine Dual Action Polishers

Compare DA Polishers

The best polishers for every need

M15 Pro

M8S V2

M21 Pro

MaxShine M15 Pro Dual Action Orbital Polisher

MaxShine M8S V2 Dual Action Polisher for Car Detailing

MaxShine M21 Pro Random Orbital Polisher vertical

Dual Action










2,200-5,000 OPM

2,500-6,500 OPM

2,200-5,000 OPM

Backing Plate





5.15 lbs

5.11 lbs

6.71 lbs

Dimensions (in)

16(L) x 4.1(W) x 5.1(H)

13.4(L) x 3.5(W) x 5.4(H)

16.5(L) x 4.2(W) x 5.2(H)

Why is the random orbital polisher, M21 Pro, the best fit for polishing an extensive area?

The random orbital polisher provides:

  • Dual action, oscillating 21mm long throw and circulating motion
  • A 6-inch backing plate, and a powerful 1000W motor 

A perfectly balanced DA polisher and six adjustable speeds make the best fit to contour extensive areas, removing swirls, scratches, and oxidation.   

What short throw polisher pairs best with the
M21 Pro 6in Dual Action Polisher?

The M312 Dual Action Polisher has a 12mm throw and 3in backing plate. This polisher tackles complex curves and smaller panels that the large M21 Pro cannot.

Weight 7 lbs
Dimensions 18.3 × 6.1 × 6.1 in
Product Dimensions & Weight

16.5(L) x 4.2(W) x 5.2(H) in, 6.71 lbs

Polisher Type

Dual Action

Orbit Diameter


Backing Plate

6in (150mm)



No Load Speed

2,200-5,000 OPM

Speed Control


Power Cord

13 Foot Heavy Duty Cable

Spindle Thread Size



Variable Speed



Maxshine_Acronim_Logo Brand


Condition New: Each product in new condition guarantees pristine quality and optimal effectiveness, setting a new standard for automotive care. Open-Box: Unbeatable Value, Trusted Quality. Shop confidently knowing our open-box products offer exceptional value without compromising on quality.


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What is the MaxShine M21 Pro 21mm Throw Dual Action Polisher?

The Maxshine M21 Pro is a dual action polisher designed for automotive detailing ranging from professional detailing to DIY projects. It features a 15mm throw and is equipped with a 5-inch backing plate for various polishing and buffing tasks. It is a high-performance tool engineered with precision to make paint correction and enhancing shine faster and easier.

Is the M21 Pro suitable for beginners, or is it more for experienced detailers?

The M21 Pro is designed to cater to both beginners and experienced detailers. Its user-friendly features and soft start function make it accessible to novices, while its power and precision cater to the demands of professionals.

Can I use the M21 Pro for both polishing and waxing my car?

Yes, the M21 Pro is suitable for both polishing and waxing, thanks to its dual action design that minimizes the risk of swirl marks and provides a gentle yet effective approach to detailing.

What does Dual Action mean?

A dual action polisher is a power tool commonly used in automotive detailing and polishing applications. It features a rotating and oscillating head, which allows it to both rotate on its central axis and oscillate in a random orbit. This dual action mechanism helps prevent swirl marks and holograms on the surface being polished, making it a preferred tool for achieving a smoother and more even finish compared to traditional rotary polishers.

What are the benefits of using a dual action polisher?

A dual action Polisher provides efficient and safe paint correction, making it suitable for both beginners and professionals. Its versatility, reduced heat generation, and user-friendly design make it an excellent choice for achieving consistent and high-quality results when polishing and detailing vehicles.

Is the M21 Pro forced rotation?

No, the M21 Pro is a random orbital polisher. There is less risk of incurring damage while using a dual action/ random orbital polisher versus a forced rotation polisher.

What is the difference between a rotary and a dual action polisher?

The primary difference between a rotary and dual action polisher is in their motion. A rotary polisher spins in a single, fixed direction, making it more aggressive but also riskier for beginners as it can easily cause swirl marks or burn through the paint. In contrast, a dual action polisher combines spinning and oscillating motions, reducing the risk of swirls and making it a safer choice for most users, especially for paint correction and detailing tasks.

Can I use a Dual Action Polisher to remove scratches?

Dual Action polishers can remove imperfections within the clear coat layer on multi-stage paint. Light scratches, heavy swirling, moderate paint etching, or other imperfections can be removed by a random orbital polisher.

It the MaxShine M21 Pro Dual Action Polisher good? What can it do?

The M21 Pro Dual Action Polisher is specifically designed to eliminate common paint defects such as swirl marks, light scratches, and oxidation. It excels at polishing surfaces to achieve a flawless shine and offers perfect protection for your vehicle's paintwork. With its adaptable orbit range and 6-inch backing plate size, it is suitable for a wide range of detailing jobs.

How does the M21 Pro compare to the Maxshine M8S V2 and M15 Pro polishers?

The M21 Pro offers a 21mm throw, which covers a larger orbit area than the 8mm throw of the M8S V2 and the 15mm throw of the M15 Pro. This makes it ideal for detailing large areas more quickly.

How does the M21 Pro compare to the Maxshine M21?

The Maxshine M21 Pro is an upgraded version of the M21. It offers improved performance and durability, making it a better choice for professionals and enthusiasts looking for more power and precision.

What are the key features of the M21 Pro?

The M21 Pro comes with a more powerful motor, improved ergonomics, and enhanced heat dissipation, allowing for longer and more efficient polishing sessions. It also has a soft start function and a precision speed dial for better control.

What does the M21 Pro come with?

The M21 Pro comes with the dual action polisher, 6in backing plate, a removable D-handle with mounting hardware, additional set of brushes, hardware for backing plate removal/replacement, and an instruction manual.

Can I use different backing plates with the M21 Pro?

The M21 Pro was designed for use with 6in backing plates. A different style of 5/16in thread dual action backing plates can be used but it is not recommended to use a plate of a different size.

What kind of warranty does the M21 Pro come with?

The warranty for the M21 Pro may vary, but it typically includes a one-year limited warranty, which covers defects in materials and workmanship. Check the warranty page for full details.

Is the M21 Pro corded or cordless?

The M21 Pro is a corded polisher, which ensures a continuous power source for consistent performance during your detailing tasks.

How does the M21 Pro compare in terms of price to other MaxShine polishers?

The M21 Pro is priced higher than the M8S V2 and M15 Pro due to its unique features and specifications. The cost difference reflects the balance between power, precision, and versatility.

Does the MaxShine M21 Pro Dual Action Polisher provide precise speed control?

Absolutely. The MaxShine M21 Pro features a variable speed trigger that allows for better control over the polishing process. You can easily adjust the speed to your preferred setting, ensuring controlled precision during every application. The polisher offers 6-speed control options, enabling you to fine-tune the speed according to the specific requirements of your project.

Is the MaxShine M21 Pro Dual Action Polisher comfortable to use?

Absolutely. The MaxShine M21 Pro prioritizes user comfort during operation. It features a large, horn-shaped, rubberized ergonomic grip that reduces fatigue, allowing for extended use without discomfort. Additionally, the adjustable and detachable handle provides customization options, further enhancing the comfort and control of the polisher.

Does the MaxShine M21 Pro Dual Action Polisher minimize vibrations?

Yes, the MaxShine M21 Pro is designed to provide a more comfortable working environment by minimizing vibrations. The large, rubberized grip and quality-ensured CNC counterweight work together to diminish vibrations, reducing operator fatigue and enhancing the overall polishing experience.

What are the specifications of the MaxShine M21 Pro Dual Action Polisher?

The MaxShine M21 Pro features a 21mm orbit size and a 6-inch backing plate, allowing for efficient and precise paint correction. It operates at a no load speed range of 2,200 to 5,000 OPM, providing ample power for various detailing tasks. The polisher comes with a 13-foot long power cord, offering flexibility during use. In terms of dimensions, it measures 16.5 inches in length, 4.2 inches in width, and 5.2 inches in height. With the plate and power cord included, it weighs approximately 6.71 lbs.

1 year warranty MaxShine - Best detailing Polishers and Buffers

MaxShine Dual Action Polishers and Buffers Warranty:

Included in the purchase of a MaxShine Dual Action Polisher or Rotary Machine is a 1-year mechanical warranty, from purchase date. Exclusions include but are not limited to dismantled equipment, normal wear and tear, improper use and not following standard operational instructions.

MaxShine Guarantee

As of September 1st, 2023, MAXSHINE will maintain, repair or replace any defective tool, due to faulty materials or workmanship for the lifetime of the warranty. Subject to certain exclusions below. Receipts are required for all warranty claims. MaxShine does not cover shipping cost for repairs.

*To efficiently process a claim under warranty please keep a copy of the proof of purchase with the MaxShine product name, business name where purchased, and the purchase date.