The air power pencil grinder with 1/8"burs and bits to shape, cut, carve,grind and engrave everything from wood ,plastic and welds .Designed for finishing of small parts and tight spots. Item No:NV-4020K Collet Capacity:1/8" Free Speed:54000 RPM Air Inlet:1/4" Air Hose(ID):3/8" Operating pressure:90 PSI AVG.Air consumption:2CFM 57L/ MMicro Air die grinder Kit including:1pc- Micro Air Die Grinder,2pc-hand wrenches,1pc-female nipple