Reversible Air Drill MD-3311B - Triple Planetary gear system provide smooth operation - Grip reverse valve enables one-handed directional changes 1/2 HP air motor provides max power - Handle exhaust Chuck Size (in) / 3/8 Spindle Size (mm) / 3/8x24UNF Net Weight (kg) / 1.1 Overall Length (mm) / 200 Free Speed (rpm) / 2,000 Air Cons Free (m3/min) / 0.58 Air Inlet (PT) / 1/4 Hose Size (in) / 1/4