This shaft has the front 2 holes drilled at 1.125 c-c to be used with our billet aluminum disk or any 1/4" thick stock or stock replacement style clutch disks. Our drive shafts are machined out of 4140 prehardened material. This material is excellent for drive shafts making it hard enough to not break but not too hard to be brittle. These shafts are cut to a standard 20" long. The customer will have to cut and drill the rear hole after clutch has been put together and the length has been determined depending on coupler, motor placement and rear end placement.