Universal steering U-joint is ideal when using after-market steering components (rag joint, universal joint, and steering shaft). This product is not required when using stock components. The U-joint couples 3/4-inch DD to 3/4-inch DD. Steel construction with nickel plated finish. Universal steering U-joint is ideal when using after-market steering components (rag joint, universal joint, and steering shaft). This product is not required when using stock components. The U-joint couples 3/4-inch DD to 3/4-inch DD. Steel construction with nickel plated finish. Compatible with 1947-1991 Chevrolet/GMC Truck Compatible with 1947-1991 Chevrolet/GMC Truck