Astro Pneumatic's 322 ONYX 6-Inch Finishing Palm Sander is high powered and includes a 5mm (3/16-Inch ) Stroke Finish. The tool is super lightweight (1.5lbs.) and has sealed bearings for extended life. Additionally, its design is compact for minimum operator fatigue and features orbital action which assures a final swirl-free finish. The motor in this tool is compact and lightweight for long term operation. Additional features include composite lever housing and rotors, low vibration and a special design that reduces sound level. The unit comes with Astro #4606 - 6" Velcro Backing Pad.