CNC machined from EN40B billet round bar, the hardest material available with through hardening capabilities not possible on standard 4340 steel. All cranks are stress relieved, shot peened, magna flux inspected and nitrided (multi step heat treatment) for ultimate performance. Fully profiled counterweights are designed for reduced windage through the crankcase creating less oil resistance for better rpm potential. These cranks are rough balanced to 1300g-1338g bobweight and fits the following: