Feature: 1. This air die grinder is made from quality alloy steel material, which has high hardness and high durability. 2. Widely used for grinding, polishing and grinding tires and removing solder joints. Suitable for deburring of products in mold factories, tire factories, shoe factories, and metal processing industries. 3. The movement adopts selected high grade steel materials and is precisely processed by advanced CNC machine tools. 4. The rotor, cylinder, cylinder head and bearings are precisely matched, which is smooth and stable, ensures high speed, low noise, and long service life. 5. This air die grinder go through one time molding process, also provides high concentricity for efficient working. Specification: Item Type: Die Grinder Material: Alloy Steel Product Model: KP-640B Chuck Size: Approx. 6mm / 0.23in No-load Speed: 18000rpm Inlet Connector: 1/4 Inch Working Pressure: 0.5-0.7MPA. Package List: 1 x Connector1 x Air Die Grinder2 x Wrench Note: Before use, confirm whether the chuck is fixed properly to prevent the air nozzle from leaking.