Clarke's PRO162 set contains 30 Chrome Vanadium Steel **Torx-Star & security bit sockets, each with a 3/8" or ¼" 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. And 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.