1/2″ drive, special size socket set with thin walls & protective sleeve to protect Alloy wheels. Contents: 15mm for Smart Car, 17mm special profile for Mercedes-Benz, 21mm special profile for Kia & Hyundai, 22mm for Opel & Vauxhall. Length: 85mm. Thin walled sockets with protective sleeve to prevent damage to alloy wheels. Manufactured from Chrome Molybdenum.