It’s fast fastening with this pro-grade alloy-steel, nickel-chrome finished hex-bit socket set. Etched size stamps simplify tool selection. Includes seven 3/8″-drive hex-bit sockets: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm, three 1/2″-drive hex-bit sockets: 12mm, 14mm and 17mm as well as a molded plastic case.