Made of quality material, to use. It can be a air saw, it is convenient to replace saw and file. The body is covered by nonslip rubber which can reduce the vibration of grinding. Safety trigger design can prevent error operation. Applicable to hardware, plastics, electronics, resins, die-casting, home, and other industries of products grinding, polishing and aluminum alloy, zinc alloy and other metal die-casting machine polishing grinding, correction, deburring, rust removal, etc