Holley steering U-joints and double "D" steering shafts offer a durable and attractive steering solution for muscle cars, street rods, and other custom applications. Available in various sizes and constructed with strong steel and black zinc finish for corrosion protection, each u-joint comes complete with set screws and lock nuts. To make installation even easier, we also offer 3/4-inch DD and 1-inch DD steering shafts, both 36 inches long.