Hardened and tempered for longer life. Includes 3/16", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", metric: 6, 8 and 10 mm. Magnetic tip holds drivers firmly in place. 10 Piece Magnetic nutsetter set Includes 3/16", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", metric: 6, 8 and 10 mm Hardened and tempered for longer life Magnet