Micro Air Grinder 1/8 (3 MM ) 58,000 R P M SUMAKE ST-3170Specifications: ST-3170 Free Speed:58,000 RPM Capacity:1/8"in (3mm) Overall Length:5-1/4" in.(132 mm) Air lnlet (PT):1/4" Air Hose(ID):3/8" Net Weight:0.2 kgs(0.5 lbs) Packing:20pcs/Ctn/1.31' Cuft/GW:8.8 kgs