OTC's 6100 is a 12 piece set of 1/4", 3/8", and 1/2" square drive standard Torx bit sockets. These sockets are designed for use with standard Torx fasteners but are also compatible with Torx PLUS fasteners. Specialty fasteners from the Torx family are used in many aspects of assemblies. Made with two piece construction S2 grade steel. Includes: T10, T15, T20, T25, T27, T30, T40, T45, T47, T50, T55, and T60 sized bit sockets. OTC's 7-Piece External Torx Socket Set features the most commonly used sizes for automotive use. Designed for use with standard 1/4 inch and 3/8 inch square drive hand tools. Set includes the following popular sizes: E6 x 25, E7 x 25, E8 x 25, E10 x 32, E12 x 32, E14 x 32, and E16 x 32.