Universal Lighting Clamp. Allows For Quick Fixing of Lights to Most Square T-bars. Supplied in Single Units. Simple to Use. Max. load 10kg. The quick way to hang your lights. Simply attach the spigot to your light and the clamp stays permanently attached to your T-bar. Just push the spigot inside the clamp- wait for it to click then turn the knob and your done.. Quick clamp-lighting clamp-stage clamp