Exact replacement for my 8 year old Craftsman 42" mower. Now it whirs instead of clattering. Quality Sten parts, included blade bolts and washers, pulley nuts and mounting bolts. Pre-threaded mounting holes made for easy installation. Grease fitting allows for filling housing with grease but bearings are sealed, packed them anyway. They've stayed nice and cool after several multi-hour mowing sessions. Best price I could find and super fast delivery. Thanks again Jacks.