Air DrillPistol Style, 1/4 In. Chuck Size, Free Speed 1600 rpm, 0.1 HP, Keyed Drill Chuck Type, 1.9 Average CFM @ 15 Second Run Time, 18 CFM @ Full Load, Required Pressure 90 psi, Air Inlet 1/4 In. NPT, Min. Hose Size 3/8 In., Composite Handle Material, Yes Variable Speed, Trigger Throttle Type, Reversing Yes, Double Bearing Bearings, Composite Housing MaterialOverall Length 7-1/4 In.Tool Weight 1.71 lb. Mini Pneumatic Drills12T590 has double-bearing design for longer life, enhanced balance, and reduced vibration. 5-vane motor for smooth and robust operation. Double-sided, adjustable speed settings for a wide range of applications. 12T590 and 10D234 are reversing.Keyed chuck Composite handle Min. hose size: 3/8"