Die Grinder, Duty Heavy Duty, Horsepower 1 hp, Collet Size 1/4 in, Grinder Orientation Straight, Air Inlet Connection Size 3/8 in, Air Inlet Gender Female, Max. Speed 12,000 RPM, Air Inlet Type NPT, Air Inlet 3/8 in NPT Female, Tool Style Straight, Kit Contents (1) Bare Tool, Includes 1/4 in Collet Insert Mfr. No. 50013, 3/8 in Collet Insert Mfr. No. 50014, 6mm Collet Insert Mfr. No. 50016, 8mm Collet Insert Mfr. No. 50039, Safety Stop Mechanisms Safety-Lock Throttle Lever