Koch Industries 4045213 PTO Spline Adapter with 1-3/8 by 6-Inch Male Spline and 1-3/8 by 21-Inch Female Spline<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Connect implements to a tractor's PTO shaft</li><li>Allows for power to be transferred from the tractor to the implement</li><li>Male Spline 1-3/8 by 6 and Female Spline 1-3/8 by 21</li><li>Adapter 21-6</li><li>Yellow zinc plated finish</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41a7Wtl5u1L.jpg" noproxy>