This 11" precision cam degree wheel by JEGS has a 3/4" center hole and comes with 3 bushings and 1 steel washer. With this product, you can degree your cam accurately while checking top and bottom dead center, centerline, and valve timing in easy-to-read 1 degree increments. This cam degree wheel is made with high quality components and is designed to fit most applications. The crank bolt bushing inserts fit 7/16. 1/2, 5/8, and 3/4 inch crankshaft bolts.