DC275 C-Clamp design opens to maximum of 2.75 inches wide (69.85mm). Our clamps and brackets are compatible with all Prism LED display arm lights. The DC275 Clamp Bracket is designed for straight or curved surfaces and has a built-in strain relief. Tradeshow Displays are made in many ways with a variety of components and Prism has a wide selection of fastening brackets to suit almost every application. Not sure which bracket works for your display? Just gives us a call and we would be happy to help you with your selection.