Specially developed to guaranteeover 90% market coverage witha limited number of references(10 types of bolts and 2 types of nuts).-10.9 steel quality (refering to the requirements of the car manufacturers) -Good corrosion resistance (passed a 360 hours salt spray test without signs of red rost) -Strong and robust (tested with a 350Nm tightening torque) Multiple-size key 17/19 or 19/21 mm.