Woodward Universal Joints are made to exacting standards from hardened chrome vanadium tool steel in two sizes. They feature ball bearing with grease seal design, stainless truss-head screws, and two set screws at each end. We recommend removing the set screws and replacing with a 1/4"-28 x 1/2" hex head bolt with a jam nut, this will allow the bolt to be much tighter, eliminating the possibility of the universal coming loose.