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.