This IRWIN Impact Performance Series 1/4-inch Lobular Nut setter utilizes impact drivers for durability and long life. Each nut setter has a lobular design that drives the fastener on the side instead of the corner for less stripping and longer life. The rare magnets in this nut setter grip the fasteners securely. A black oxide finish provides corrosion-resistance to increase the life of the bit. A 1/4-inch quick-change shank reduces slipping in most standard drill chucks.