Bits made from industrial S2 steel, M4 - M14 Bit sizes in both 30mm and 75mm lengths, 3/8"" Dr, and 1/2"" Drive bit holders included, Ideal for late model German engineered vehicles for cylinder head, headlight, and transmission fill plug applications, Heavy duty blow molded storage case, Set Includes:, 3/8"" Dr, Bit Holder, 1/2"" Dr, Bit Holder, M4 - M14: 30mm and 75mm lengths Model, SKU: ISN15868