Universal steering U-joints Available in a variety of sizes for most applications Steel construction with retaining screws on the bearing caps for strength and durability Black zinc finish for a great look and corrosion protection Includes set screws and lock nuts 13/16"-36 Spline x 3/4" DD. Holley steering U-joints are attractive, durable, and strong. The steel components are manufactured for extreme durability (ideal for muscle cars, street rods, and custom applications). The black zinc finish looks great and provides corrosion protection. Choose from a variety of popular sizes.. Use thread locking compound, torque the set screws, and lock nuts to 12 ft/lbs.