15pc Star Torx Torque Bit Socket Set, 3/8 and 1/4 Inch Drives, Sizes ST 10 - 60 3/8 inch drive sizes: ST - 40, 45, 47, 50, 55, and 60. 1/4 inch drive sizes: ST - 10, 15, 20, 25, 27, and 30. 3/8 to 1/4 inch drive adapter. 2 metal spring storage racks. Durable Chrome Vanadium Construction to fight against tool rust.