Irwin 1899939 Impact Magnetic Nutsetter, 1/2" x 12"Highlights: Size: 1 2" Overall length: 12" Socket body diameter: 3 4" Shank diameter: 1 4" Lobular design drives fastener on side instead of corner for less stripping and longer life Built for maximum durability and long life with impact drivers 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 Black