It is a Clamp Fixture/Portable Clamp/Table Bench Vise/DIY Tools/Hand Tools, Clamp Thickness: 35mm, Material: Cast Aluminum, Max Depth of Mounting Clamp: 1.38"/ 35mm, Application: Mainly used for small Jewelry, Hobby Model, Electronics, Crafts, Arts, Angular, Olive, Walnut, Tables, Garage, Round Objects, etc.