Adam's Swirl Killer 21mm
A 21 mm polisher at a modest price for large flat panels, though its maker publishes little beyond the orbit.
Amazon $229.49$229.49
The Adam's Swirl Killer 21mm is the better dual action car polisher overall, rated 3.5 to 3.4. The Adam's Swirl Killer 21mm leads on value and features. The Adam's Swirl Killer 21mm costs $364.51 less ($229.49 vs $594).
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.
RUPES BigFoot LHR21 Mark V
A 21 mm polisher for big, flat panels on trucks, vans and boats, for professionals who already own a smaller machine for tight spots.
Amazon $594$594
Which should you buy?
- Choose the Adam's Swirl Killer 21mm for value ($229.49 vs $594) and features (soft start, cordless or a 20 ft+ cord, lock-on trigger vs cordless or a 20 ft+ cord).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every corded long-throw dual action car polisher; a clear win is highlighted. How we rank explains each one.
| Factor weight | Adam's Swirl Killer 21mm | RUPES BigFoot LHR21 Mark V |
|---|---|---|
| Overall rating | 3.5/5 | 3.4/5 |
| Correction 30% | 100 21 mm orbit | 100 21 mm orbit |
| Value 25% | 54 $229.49 | 1 $594 |
| Warranty 15% | 0 warranty not published, scored as none | 100 5-year warranty |
| Power 10% | 50 motor rating not published (neutral score used) | 14 500 W |
| Weight 10% | 50 weight not published (neutral score used) | 66 5.4 lb |
| Features 10% | 50 soft start, cordless or a 20 ft+ cord, lock-on trigger | 15 cordless or a 20 ft+ cord |
Specifications
| Adam's Swirl Killer 21mm | RUPES BigFoot LHR21 Mark V | |
|---|---|---|
| Polishing | ||
| Orbit diameter | 21 mm | 21 mm |
| Speed range | - | 3,000-4,500 OPM |
| Backing plate | - | 6 in |
| Forced rotation | No | No |
| Power | ||
| Power source | Corded | Corded |
| Motor rating | - | 500 W |
| Cord | 25 ft | 30 ft |
| Brushless motor | Not listed | Not listed |
| Controls | ||
| Constant-speed electronics | Not listed | Not listed |
| Soft start | Yes | Not listed |
| Lock-on trigger | Yes | Not listed |
| Build | ||
| Weight | - | 5.4 lb |
| Pads or polish included | No | No |
| Warranty | - | 5 years |