Special profile that fits undamaged/damaged and rounded nuts Contents: 12 x 3/8in.D Sockets Sizes: 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm Plus 1 x 1/2in.D > 3/8in.D Adaptor Manufactured from Chrome Vanadium Supplied on a socket rail