Clarkes PRO162 set contains 30 Chrome Vanadium Steel ** Torx-Star & security bit sockets, each with a 3/8" or 14;" square drive for any equivalent square drive ratchet. The full set contains many of the most commonly needed sizes of tamper-proof fastener sockets & Torx Star driver bits. & each socket & bit is covered by Clarkes * Lifetime Tool guarantee for that extra piece of mind, this fantastic ** Torx Star bits for Torx fasteners. Torx is the registered trademark for Camcor / Textron Inc.