This heavy-duty coupler features a working load limit up to 264lbs (120kg) and is designed to fit tubes/pipes with diameters between 48mm-51mm. The Kupo Coupler for Cheese Plate is a lightweight and low-profile professional coupler, constructed from high-tensile aluminum extrusion. With a 3/8"-16 threaded female & stainless-steel bolt it allows for quick and easy mounting to the cheese plate. Ideal for a camera car mount rig.