21 HP@540 RPM For Post Hole Digger Implement end 1 1/4? Round Bore with PinholeUse U-Joint 3013-6042 Collapsed Length52"Driveline ConnectorTractor end: 1 3/8" 6 Spline QD, Implement end 1 1/4" Round Bore with PinholeID1 3/8"ID 21 1/4"Number of Splines6Rating2SRPM540