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Pneumatic Pencil Die Grinder Kit Micro air-powered pencil die grinder tool, Mini Pencil Polishing Rotary Cutting Tool SetVarious types of welding surface grinding.All kinds of metal precision grinding Cleaning of various metals, chamfering, grinding, carving, internal processing.Specification:Material: Metal + PlasticRPM: 58000rpmCollet Size: 3mmAir Inlet size: 1/4" NPTAir Hose: 3/8"Air Pressure:6.3kg/cm2Length of pen:152mmGrinding Head Shank Size: 3mmPackage Including:1 X Air Micro Die Grinder Set (As pictures shown)Cautions:Pneumatic tools must be lubricated before and after use.Keeping the machine oily can extend the life of the machine. When running the machine for the first time, it must be lubricated with special pneumatic oil through the air guide tube.