Feature:1. Lightweight and comfortable ergonomic design for hand-held work2. Fast grinding speed and easy operation3. Matte non-slip handle for a comfortable feeling4. Back-row design does not blow dust to the floor material, and the excess lubricant will be discharged from the rear vent material5. High quality material can make sure the durability and stability of the productSpecification:Item Type: Pneumatic GrinderSpeed: 25,000rpmWorking Pressure: 6Air Pressure: 5-7kg/cmDiameter: 3-6inInlet Size: 1/4inRecommended Air Pipe Diameter: 5mmChuck: 3mm.Package List:1 x Pneumatic Grinder1 x User Manual2 x Wrench1 x ChuckNote: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.