9/16/ Spline Nut for 1/2/ 12 Edge Raceware specializes for over 40 years in the production of bolts and accessories for the German car market. The company is the world record holder and develops all products to aeronautical specifications in order to increase the efficiency and reliability. Therefore Raceware was also selected as an OEM supplier for cylinder head bolts supplier for PORSCHE. The production is designed not only for the highest performance. In design, calculation and production follow extensive testing to guarantee fatigue strengths as with standard hardware can continue. So it is possible, the screw to make resilient many times. The products are easy to install and a direct replacement for original parts for.