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 tsui, two wrenches, one 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