Vermont American 16067 Gold Nutsetter, 5/16-Inch to 1-5/8-Inch Ideal for fast, easy driving of nuts, bolts and hex head screws. The non-magnetic chip ring holds the fastener securely without causing chip build-up Rugged, single piece construction provides long life under constant heavy duty use, and the precision formed tip ensures a proper fit. Its a three piece set with 1/4", 5/16" and 3/8" nutsetters Universal 1/4" hex shank with power groove Universal 1/4" hex shank with power groove