Replacement OEM Series 6 ME Style Constant Velocity Joint, complete ready to install. 1-3/8" X 6 Spline with Push Pin Quick Disconnect and Metric Series 6 Triangular Yoke on the other end. Fits 54mm Tubing ("A" Dimension in PTO Tube Drawing) Heavy Duty Series 6 fits most larger mower applications, rated 100hp @1000 rpm and 64hp@540 rpm.