Features: Made by zincs alloy and rubber, enduring and long terms use. Available for Glass, Metal or Wood Panels. It provides additional flexibility in attaching glasses to wall or substrates. Easy to install, supports screw install and expansion rubber stopper install, you can choices the install way as you need. The glasses shelf is finely plated to be unfading, which is a good option. Specifications: Component: zincs Alloy Type: Oval/Round Oval Size:about 2.7x1.4cm/1.06x0.55inch Round Size:about 3.7x2.1cm/1.46x0.83inch Package Includes: 1pc Advertising Plate Glass Clamp note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.