This super clamp is made of strong, rust-proof stainless steel + black anodized aluminum alloy for ultimate durability. It can be mounted almost anywhere you need it, such as cameras, lights, umbrellas, hooks, shelves, glass panels, crossbars, and even other super clamps. The jaws open to about 55mm. You can clamp it on objects less than 40mm and more than 15mm thick for best results. Non-slip and protective: The rubber pads on the metal clips prevent slippage and can protect your items from scratches.