Product Description: 80 Degree Complete Constant Velocity Driveline, 540 rpm. C-to-C Length: 48" (1210 mm); Total Length: 58"; Tractor end: 1-3/8" - 6 Spline; Implement end: 1-3/8" - 21 Spline. Size: 2580. NOTE: It may be necessary to cut this driveline to length. Verify the length by ensuring that sufficient overlap of the drive tubes exists in all working positions without the possibility of bottoming out. FitsRotary Cutter: 1508. It may be necessary to cut this driveline to length. Verify the length by ensuring that sufficientoverlap of the drive tubes exists in all working positions without the possibility of bottoming out.