High powered 5mm (3/16") Stroke Finish Super lightweight (1.5lbs.) Sealed Bearings for Extended Life Compact for minimum operator fatigue Orbital action assures final swirl-free finish Built-in speed regulator Compact and lightweight motor for long term operation Composite lever housing and rotors Special design reduces sound level Low vibration Unit comes with Astro #4606 - 6" hook and loop Backing Pad .