Universal Tool UT8799-165 Air Palm Sander, 5-Inch 0.35HP lubrication free motor for stall resistance Built in speed regulator for control Comfortable rubber palm grip Rear exhaust keeps air away from work area 0.35HP lubrication free motor for stall resistance Built-in speed regulator for control Comfortable rubber palm grip Rear exhaust keeps air away from work area Best for finishing applications on wood, metal, painted and composite materials