Triangle grinding machine, suitable for uniform polishing of the higher requirements of the surface, the corners should also be smooth and bright. Reciprocating drive, low vibration, low noise, high speed, improve work efficiency. Ergonomic design, rubber wrapped handle, non-slip and comfortable operation, long time holding will not feel tired. The trigger is designed with pressure plate, which conforms to human mechanics, easy to press, comfortable to feel and easy to control. Rear pneumatic control switch, you can choose the right speed according to your own work, the proper reciprocating frequency can guarantee the sanding effect. Helps you to do fine sanding jobs like woodworking, furniture polishing plastic aluminium and metal-polishing.