Koch Industries 4045123 PTO Short Increaser with 1-3/8 by 6-Inch Male Spline and 1-1/8 by 6-Inch Female Spline Connect implements to a tractor's PTO shaft Allows for power to be transferred from the tractor to the implement Male Spline 1-3/8 by 6 and Female Spline 1-1/8 by 6 Yellow zinc plated finish