We are a professional manufacturer of drive shafts and universal joints for farm tractor in China. The yoke we make are six spline, Lemon and threaded hole. The sizes are 1#,2 #,3#, 4 #,5#, 6 # ,4# with slip clutches and 6# with slip clutches: 1) 1 shaft: a) length: 27" - 50" b) Six spline ends: 1-3/8" c) Up to 30HP tractors 2) 4 shaft: a) Length: 29" - 53" b) Six spline ends: 1-3/8" c) Up to 56HP tractors 3) 6 shaft: a) Length: 36" - 56" b) Six spline ends c) Up to 100HP tractors 4) 6 shaft with slip clutch: a) Length: 36" - 56" b) Six spline, Lemon and keyway threaded hole c) Up to 160HP tractors at 1,000rpm