Craftsman 12 Pc. 1/4" & 3/8" Drive Torx Tamper Socket SET This bit socket set is designed for tamper-resistant Torx fasteners. Bit sockets are constructed of high-strength alloy steel and heat treated to provide added strength 1/4-in. Drive: T7, T8, T10, T15, T20, T25, T27 3/8-in. Drive: T30, T40, T45, T50, T55 They are average 25% stronger that Lisle bit sockets