Chrome vanadium steel nut driver set for use with power drills. 1/4″ hex drive. Includes sizes 1/4″, 9/32″, 5/16″, 11/32″, 3/8″, 13/32″, 7/16″, 15/32″ and 1/2″. Compatible with all 6.35mm chucks. Chrome vanadium steel nut driver set for use with power drills. 1/4″ hex drive. Includes sizes 1/4″, 9/32″, 5/16″, 11/32″, 3/8″, 13/32″, 7/16″, 15/32″ and 1/2″. Compatible with all 6.35mm chucks.