A comprehensive mechanics bit set. 3/8" and 1/2" drive holders. Mechanics socket set in a metal case. This comprehensive set covers most of the common sizes of torx bits making it ideal for mechanics and general workshop use. Insert bits manufactured from silicon steel, hardened and tempered with shot blasted finish. Bit holders made from chrome vanadium steel hardened, tempered and chrome plated. Set contains: 1/2" adapter. 3/8" adapter. Hex bits 4, 5, 6, 8, 10, 12 x 30mm long. Hex bits 4, 5, 6, 8, 10, 12 x 75mm long. Spline bits M5, 6, 8, 10, 12 x 30mm long. Spline bits M5, 6, 8, 10, 12 x 75mm long. Star bits T20, 30, 40, 45, 50, 55 x 30mm long. Star bits T20, 30, 40, 45, 50, 55 x 75mm long