Features and Benefits:•Exact Fit Precision Machined Bits•Through Hardened For Maximum Durability•High Performance CRM-72 Tool Steel•Natural Finish Bit, Chrome Plated Sockets•Fits Standard 1/2" Square Drive RatchetsTorx Bit Socket 3/8" Square Drive with 1/4" Replaceable Hex Bit 8 Piece Set T9 - T40 On Rail