Our billet tube clamps have been copied and knocked off for 15+ years. We machine ours from aircraft quality 4130 chromoly, not cheap mild steel. Our design is lighter and stronger compared to others and we offer a wider range of sizes and styles. These work great for tubes and structures that need to be easily removed. Don't be fooled by cheap & inferior imitations. The smaller 3/4" - 1-1/4" OD sizes have an over lapping flat joint and the larger 1-1/2" - 2" OD sizes have an interlocking stepped joint.