We are a professional manufacturer of drive shafts and universal joints for farm tractors in China. The shafts are with six splines and threaded holes. Features: 1) 1 shaft: a) Length: 27" - 50" b) Six spline ends: 1-3/8" c) Up to 30HP tractors 2) 4 shafts: a) Length: 29" - 53" b) Six spline ends: 1-3/8" c) Up to 56HP tractors 3) 6 shafts: a) Length: 36" - 56" b) Six spline ends c) Up to 100HP tractors 4) 6 shafts with slip clutch: a) Length: 36" - 56" b) Six splines, lemon and keyway threaded hole c) Up to 160HP tractors at 1,000rpm