Features: 1.Lightweight and comfortable ergonomic design for hand-held work 2.Fast grinding speed and easy operation 3.Matte non-slip handle for a comfortable feeling 4.Back-row design does not blow dust to the floor material, and the excess lubricant will be discharged from the rear vent material 5.High quality material can make sure the durability and stability of the product Specification: Item Type: Pneumatic Grinder Speed: 25,000rpm Working Pressure: 6 Air Pressure: 5-7kg/cm2 Diameter: 3-6in Inlet Size: 1/4in Recommended Air Pipe Diameter: 5mm Chuck: 3mm Note: 1. Please give oil 3-5 times a day, the method of oil is injected from the inlet 0.5CC oil, let the tool idling 3-5 seconds. 2. Oil types: Please use #15 pneumatic tools for oil. 3. Impact Wrench In addition to the above oil, the strike part about once in five months, the strike part removed parts, the old butter wipe clean, cast a amount of butter to be appropriate (about 10-15CC) If you add too much butter, will lead to torsion worse.