A 40pc bit set designed for the automotive engineer with Hex, Star* and Spline bits, in two different lengths. 30mm bits: Hex 4, 5, 6, 7, 8, 10, 12mm; Star* T20, T25, T30, T40, T45, T50, T55; Spline M5, M6, M8, M10, M12.75mm long bits: Hex 4, 5, 6, 7, 8, 10, 12mm; Star* T20, T25, T30, T40, T45, T50, T55; Spline M5, M6, M8, M10, M12. 2 x drive adaptors: 3/8"D, 1/2"D. Bits manufactured from impact grade S2 steel.