1This air die grinder is made from quality alloy steel material, which has high hardness high durability. 2Widely used f grinding, polishing grinding tires removing solder joints. Suitable f deburring of products in mold facties, tire facties, shoe facties, metal processing industries. 3The movement adopts selected high grade steel materials is precisely processed by advanced CNC machine tools. 4The rot, cylinder, cylinder head bearings are precisely matched, which is smooth stable, ensures high speed, low noise, long service life. 5This air die grinder go through one time molding process, also provides high concentricity f efficient wking. Item Type: Die Grinder Material: Alloy Steel Product Model: KP-640B Chuck Size: Approx. 6mm or 0.23in No-load Speed: 18000rpm Inlet Connect: 1 or 4 Inch Wking Pressure: 0.5-0.7MPA 1 x Connect 1 x Air Die Grinder 2 x Wrench Befe use, confirm whether the chuck is fixed properly to prevent the air nozzle from leaking.