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. Includes sizes: 1/4", 5/16", 3/8", and 7/16".