... speed: 18000rpm. 3.Collet: 1/4", 1/8" (6 mm, 3 mm) 1/4"(6mm) Air Die Grinder(use on ship) SPT ... -14232 Free Speed: 18000 rpmCollet: 1/4", 1/8" (6 ... mm, 3 mm)Avg. Air Cons.: 4 cfm Air Pressure: 90 psi Air Inlet.: 1/4" Air Exhaust: frontNet Weight: 0.7 kgs ... G.W.: 12/13kgs Ctn Size: 42x21.5x22cm 1/4"(6mm) Air Die Grinder(use on ship) professional tools