Edelbrock part #15815 is a 15% overdrive crank pulley is for use with a 2014-19 Corvette Stingray with an Edelbrock Supercharger System installed. It features an 8.7in. diameter 10-rib secondary and stock diameter primary drive that delivers maximum traction and stability in supercharged applications. It's an ideal solution when a smaller pulley is not an option.