52 HP@540 RPM For Rotary Cutter Implement end 1 3/8" Round Bore with PinholeUse U-Joint 3013-6032 Collapsed Length51"Driveline ConnectorTractor end: 1 3/8" 6 Spline QD, Implement end: 1 3/8" Round Bore with PinholeID1 3/8"ID 21 3/8"Number of Splines6Rating5SRPM540