Makita Magnetic Nutsetter Set is designed to drive hex head nuts and self-tapping screws in a variety of applications. The hex shanks are for use with high-torque impact drivers and driver-drills. Flat edges at the hex opening provides full contact with flanged hex head screws. The magnet allows for easy one-handed operation. The set includes a 1/4" 3/8" and 5/16" nutsetters.