OEM replacement gearbox for Woods Rotary Cutters Models BB48X, HC48, HC60, RCC42 with the flat top gearboxes. 1-3/8" Shear bolt input shaft with a 1.97" X 12 Spline output shaft, 1:1.93 speed up ratio. This is a new OEM gearbox that we ordered for a customer who then changed his mind, it's a little dusty with a few scratches from sitting out in our shop but has never been installed!