Kupo 3-Way Frame Corner for 30mm Square Tube Pack of 4

The Kupo FC30 is a set of four black steel 3-way frame corners built for 30mm square tube, each with welded threaded sockets and a metal brake mechanism that clamps the tube securely without marking it. They're the standard way to join lengths of 30mm box tube into custom flag frames, light control windows, or overhead softbox and diffusion frames. At 3.2kg for the set, they're a practical building block for grip and lighting departments assembling frames to a non-standard size on set.