12 point design means less wear on fasteners. All Sunex Tools Impact Sockets are forged from the highest quality chrome molybdenum alloy steel for long life. Fully guaranteed. Packaged in compact blow molded case for durable, convenient storage and transport Set includes: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 32mm, 33mm, 34mm, 35mm, and 36 mm.