Using bearings imported from Japan long life can withstand high rotational speed improve the grinding speed. Rotary concentricity of carved mill can reach 0.01 ~ 0.03 m/m little vibration can make grinding rods and durable 2 times more smooth and work-piece after grinding.Parameters: RPM 70000 RPM. Chuck specifications: 3mm. The average gas consumption: 60 l/min.Net weight 0.3kg. Accessories: 2.3/3.0 cable tsuitwo wrenchesone oil filling bottle.Features: Small size light weight aluminum pencil fingertips can buy fully grasp. Precision design of blade grinding painted safety durable high-speed rotation can adapt to high speed precision machining. Interior design is excellent coreless vibration can operation for a long time. The rear exhaust chip flying with low noise. Easy to assemble and unassembled. Applications; All kinds of metal precision cut; All kinds of metal jie chamfering grinding carving internal processing; Plastic stone wood cutting grind cutting grinding such as; The surface grinding all kinds of welding; Other complex curved surface and inside the gear chamfering and other purposes