Sunex SX111 3/8-Inch Palm Grip Impact Wrench,Sunex International,SX111" /> Ring retainer for positive socket retention Compact, lightweight design Butterfly throttle for directional control Built-in regulator for speed control Specifications: square drive (in.) 3/8 , max. torque (ft. lbs. @90psi) 75 , working torque (ft. lbs.) 30-60 , free speed (rpm) @ 90psi 10,000