●The Universal C-Clamp is made of aluminum, plastic and metal. ●It provides both 1/4"-20 thread holes and 3/8"-16 thread hole. ●Attaches easily to desks, carts, benches, worktables, posts, etc. ●C-clamp jaws expand from 3mm to 42mm wide. ●Material: Aluminum, Plastic & Metal,Color: Red