Milwaukee® Left Hand Thread Chuck Screw is designed for 14.4 V 1/2" power plus driver-drill, 1/4" T.S.C reverse hole-shooter, 3/8" T.S.C reverse hole-shooter, 3/8" T.S.C keyless 2800 RPM Magnum® hole-shooter, 12 V 3/8" cordless drill, 10 mm drill, electric drill/drivers and hammer drills.