TEKTON 3/8-Inch Drive Star Bit Socket Set, T10 - T50, 9-Sockets | 1351 Hardened carbon steel sockets with corrosion-resistant chrome plated finish High-strength chrome vanadium steel bits Precisely-machined ends for exact fit in fastener head Notched drive end locks onto drive tang to prevent sticking in fastener or being dropped 9-pc. 3/8 in. drive star bit sockets: T10, T15, T20, T25, T27, T30, T40, T45, T50