Scat 4340 Crankshafts are machined from a premium 4340 steel and are heat treated for maximum strength and typically feature: Straight shot & chamfered oil holes, Nitride hardened for superior wear resistance, Lightening holes in all rod throws Large radius on all journals, Precision ground, Heat treated, shot peened, All Inspected & micro-polished at Scat. For absolutely serious street and racing applications, these crankshafts are the only choice. They are perfect for high horsepower, torque and RPM and work great for all levels of power adders. Weights available in Standard, Pro Series Lightweight, F-43 Lightweight and Superlight Light.