The Lunati degree wheel is CNC machined with a 10 in. diameter and 1.250 in. mounting hole. It comes complete with mounting hub and adapters for both 1/2 in. and 7/16 in. crankshaft bolts. This wheel is degreed on both sides. Side A is used for checking lobe centers and side B is for checking cam duration. Instructions are included. In addition, we have our degree wheel kit that includes a 10 in. diameter degree wheel, a steel deck strap and a 1 in. dial indicator with a magnetic base stand for easy use.