Handy 'O' clamp wraparound design and large wing nut Designed for use with 2' truss or pipe Designed for 2' Truss: Specifically engineered to fit and securely grip 2-inch (50mm) diameter truss tubing, a common size in stage and event rigging. Aluminum Construction: Made from high-grade aluminum alloy, providing a strong, lightweight, and corrosion-resistant solution.