Griot's Garage G15
A 15 mm long-throw polisher at a mid-range price, for enthusiasts who want quick correction and a lifetime guarantee.
Amazon $249.99$249.99
The Griot's Garage G15 rates 3.6 among corded long-throw dual action car polishers; the SPTA 18V Cordless 15mm Kit rates 3.1 among cordless ones. The Griot's Garage G15 costs $10 less ($249.99 vs $259.99).
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.
SPTA 18V Cordless 15mm Kit
#3 in CordlessFull review
A complete cordless 15 mm kit at a low price, for occasional use where there is no outlet nearby.
Amazon $259.99$259.99
Scores side by side
These two sit in different type classes (corded long-throw and cordless), 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 | Griot's Garage G15 | SPTA 18V Cordless 15mm Kit |
|---|---|---|
| Overall rating | 3.6/5 | 3.1/5 |
| Correction 30% | 62 15 mm orbit | 62 15 mm orbit |
| Value 25% | 49 $249.99 | 47 $259.99 |
| Warranty 15% | 100 lifetime guarantee against defects | 0 6-month warranty |
| Power 10% | 100 1,100 W | 50 18 V battery; cordless makers publish no motor rating (neutral score used) |
| Weight 10% | 50 weight not published (neutral score used) | 50 weight not published (neutral score used) |
| Features 10% | 0 none of the listed features | 50 brushless motor, cordless or a 20 ft+ cord, lock-on trigger |
Specifications
| Griot's Garage G15 | SPTA 18V Cordless 15mm Kit | |
|---|---|---|
| Polishing | ||
| Orbit diameter | 15 mm | 15 mm |
| Speed range | 3,000-5,300 OPM | 2,000-4,800 OPM |
| Backing plate | 5 in | - |
| Forced rotation | No | No |
| Power | ||
| Power source | Corded | Cordless |
| Motor rating | 1,100 W | - |
| Battery | - | 18 V |
| Batteries included | - | Yes |
| Cord | 10 ft, detachable | Cordless |
| Brushless motor | Not listed | Yes |
| Controls | ||
| Constant-speed electronics | Not listed | Not listed |
| Soft start | Not listed | Not listed |
| Lock-on trigger | Not listed | Yes |
| Build | ||
| Pads or polish included | No | Yes |
| Warranty | Lifetime | 6 months |