... hole. The sizes are 1# shafts, 2# shaft, 3# shaft, 4# shafts, 5# shaft, 6# shafts, 4# shafts with slip clutches ... b) Six spline ends c) Up to 100HP tractors4) 6# shaft with slip clutch: a) Length: 36" - 56" b) ... hole. The sizes are 1# shafts, 2# shaft, 3# shaft, 4# shafts, 5# shaft, 6# shafts, 4# shafts with slip clutches ... hole c) Up to 160HP tractors at 1,000rpm High Quality Agriculture Drive Shafts