Degree Wheel measures 11" diameter with 1-7/8" hole. Small ID adaptor kit (DW-MK2) mounts it to cranks using fasteners 7/16" - 3/4" or use the turning tool for that engine to mount the wheel. Slip the crankshaft turning tool over the crank snout with the dampener removed and turn to desired postion. Use iwth 1/2" drive ratchet. Standard Kit includes DW-11 and DW-MK2.