This complete set of multi-tooth or Triple Square Bits, aka XZN® are made of high-grade S2 steel and complemented with 1/2” square drive sockets. Drop forged and carefully heat-treated S2 steel (carbon, silicon, manganese, chromium, molybdenum and vanadium), they are perfectly constructed for overall bit body strength but still gentle on screw heads – “Schrauben Schonenderes”. This highly versatile bit set is great for professionals and hobbyists when working on most European vehicles like BMW, Mercedes, VW, Audi, Porsche, etc. One of the must have for your tool truck.