Includes 10 sizes, E5 through E20. Made of heat-treated alloy steel. Sockets are kept in a convenient vinyl holder. Lisle Corporation. 10pc Master Torx Socket Set #26280. For External Torx Bolts. 1/4″ drive: E-5 (Bolt Size #8, 4mm), E-6 (Bolt Size #10, 5mm), E-7 (Bolt Size 5/16 stud), & E-8 (Bolt Size #12 &1/4″, 6mm).