Heavy Duty Replacement stump jumper for Big Bee Darrell Harp rotary cutters, fits Agri Series, Titan, LW and L Series 4', 5' and 6' cut mowers with 40 hp. gearboxes in both 3-point and pull type hitch. This stump jumper is 16-1/2" diameter on the bottom and about 20-1/2"" diameter at the top, has 1-1/8" bolt holes with a key slot that are 13-1/2" on center. The blade bar has been reinforced with vertical bars on either side to add extra strength and the blade pan itself is now made from thicker material. There is a hub welded into the pan with 12 tapered splines that measures 1.57" at the top. All Big Bee / Darrell Harp mowers with 40 hp. gearboxes have a 1.57" X 12 spline shaft coming out of the bottom of the gearbox, gearboxes with a 2" x 15 spline shaft require a different stump jumper!