The Arch Coupler is a lightweight and low profile professional coupler, constructed from high tensile aluminum extrusion. It has been developed for installations where load capacities of up to 330lbs (150kg) are required. The KUPO professional couplers combine strength and durability with a high degree of safety. The Arch Coupler is designed to fit tubes with diameters between 38mm-51mm. It has double levels counter and sunk for M10 or M12 hex for customer solutions. It has a black anodized finish.