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
21 mm
3.4/5
A 21 mm polisher for big, flat panels on trucks, vans and boats, for professionals who already own a smaller machine for tight spots.
- 21 mmOrbit
- 3,000-4,500 OPMSpeed
- 500 WPower
- 5 yearsWarranty
Check price at Amazon$594
Price checked November 8, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 21 mm orbit covers large flat panels fastest
- 30 ft cord reaches around a car without an extension
- Five-year warranty once registered
Cons
- Big 6 in pad struggles on tight curves and narrow pillars
- Among the most expensive corded polishers here
The RUPES BigFoot Mark V family
Every RUPES BigFoot Mark V model we rank, smallest first. Ratings compare each against its own type.
| Model | Orbit | Rating | Price |
|---|---|---|---|
| RUPES BigFoot LHR15 Mark V | 15 mm | 3.1/5 | $552 |
| RUPES BigFoot LHR21 Mark V (this one) | 21 mm | 3.4/5 | $594 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | LHR21V/US/STD |
|---|---|
| Polishing | |
| Orbit diameter | 21 mm |
| Speed range | 3,000-4,500 OPM |
| Backing plate | 6 in |
| Forced rotation | No |
| Power | |
| Power source | Corded |
| Motor rating | 500 W |
| Cord | 30 ft |
| Brushless motor | Not listed |
| Controls | |
| Constant-speed electronics | Not listed |
| Soft start | Not listed |
| Lock-on trigger | Not listed |
| Build | |
| Weight | 5.4 lb |
| Pads or polish included | No |
| Warranty | 5 years |
Alternatives in this type
Maxshine M21 Pro
The lowest-priced 21 mm polisher from a detailing brand, for quick correction on large vehicles.
Amazon $258.99$258.99
21 mm1,000 W6 in
RUPES BigFoot LHR15 Mark V
The detailer’s benchmark 15 mm polisher, for professionals who polish every day and want a light tool with a long cord.
Amazon $552$552
15 mm500 W5 in
Compare
Compare the RUPES BigFoot LHR21 Mark V with any other dual action car polisher →
More from RUPES: every RUPES product ranked.