CAMVATE Universal C-Clamp,Aluminum Support Clamp Desktop Mount Holder Stand with 1/4-Inch- 20 & 3/8-Inch-16 metal female socket The Universal C-Clamp is made of aluminum, plastic and metal. It provides twelve 1/4"-20 thread holes and one 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: Black