Replacement universal fit stump jumper fits most 4', 5' and 6' cut mowers with 40 hp. gearboxes in both 3-point and pull type hitch. This stump jumper is 17" diameter on the bottom and about 21" diameter at the top, has 1-1/8" bolt holes with a key slot that are 13-1/2" on center. There is a hub welded into the pan with 12 tapered splines that measures 1.57" at the top. The bolt kit includes hardened blade bolts with hardened lock washers and jam nuts. The replacement blades are designed to provide a 4' cutting width in this installation. They measure 18-3/4" overall length and 16-1/4" effective length giving this setup a cutting width of 46 "