Kupo Corner with Nut for Butterfly Frame

The Kupo FC15B Frame Corner is an L-shaped, black powder-coated steel connector with an integral nut, built to join 30x30mm square tube for assembling a Kupo Butterfly Frame. It comes with two metal knobs for tightening the joint securely, and pairs with the matching FC15A adapter plus an A17 bolt when a collapsible frame configuration is needed for storage. It's a durable, no-frills corner piece for building custom silk or diffusion frames.