Milwaukee M18 FUEL 21mm
#1 in CordlessFull review
A cordless 21 mm polisher for large vehicles, for anyone already on the Milwaukee M18 platform.
Amazon $254.99$254.99
The Milwaukee M18 FUEL 21mm rates 3.6 among cordless dual action car polishers; the Maxshine M21 Pro rates 3.4 among corded long-throw ones. The Milwaukee M18 FUEL 21mm costs $4 less ($254.99 vs $258.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Maxshine M21 Pro
The lowest-priced 21 mm polisher from a detailing brand, for quick correction on large vehicles.
Amazon $258.99$258.99
Scores side by side
These two sit in different type classes (cordless and corded long-throw), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Milwaukee M18 FUEL 21mm | Maxshine M21 Pro |
|---|---|---|
| Overall rating | 3.6/5 | 3.4/5 |
| Correction 30% | 100 21 mm orbit | 100 21 mm orbit |
| Value 25% | 48 $254.99 | 47 $258.99 |
| Warranty 15% | 50 3-year warranty | 0 1-year warranty |
| Power 10% | 50 18 V battery; cordless makers publish no motor rating (neutral score used) | 86 1,000 W |
| Weight 10% | 50 weight not published (neutral score used) | 50 weight not published (neutral score used) |
| Features 10% | 15 cordless or a 20 ft+ cord | 0 none of the listed features |
Specifications
| Milwaukee M18 FUEL 21mm | Maxshine M21 Pro | |
|---|---|---|
| Polishing | ||
| Orbit diameter | 21 mm | 21 mm |
| Speed range | 2,400-4,500 OPM | 2,200-5,000 OPM |
| Backing plate | 6 in | 6 in |
| Forced rotation | No | No |
| Power | ||
| Power source | Cordless | Corded |
| Motor rating | - | 1,000 W |
| Battery | 18 V | - |
| Cord | Cordless | - |
| Brushless motor | Not listed | Not listed |
| Controls | ||
| Constant-speed electronics | Not listed | Not listed |
| Soft start | Not listed | Not listed |
| Lock-on trigger | Not listed | Not listed |
| Build | ||
| Pads or polish included | No | No |
| Warranty | 3 years | 1 year |