Impact Performance Series™ lobular nutsetters are built for maximum durability, performance, and long life with impact tools. Rare earth magnets hold fasteners securely with four times the hold of standard magnets. 1/4" quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks. Hex drive 1/4”. Socket 7/16”. Shank diameter 1/4”. Overall length 4”.