1/4 + 1/8 Inch Air Compressor Die Grinder Kit 3/6mm Shank Mounted Stones Grinding Polishing Engraving Tools Set Pneumatic Tools ,Easy to Use

1.Collect Chuck, for 3mm and 6mm Standard Grinding Bits.Speed up to 22000 rpm, 90 PSI Operating Pressure. 2.It's ideal for cleaning and polishing of jewelry, porting cyliner heads, dies or any hobby and craft uses.