The unique design of the Studio Designs’ Metal Disk Lamp Clamp makes it a great addition to your drafting table or office desk. Simply fit the top of the disk assembly into a standard cord management hole (2” -2.25” in diameter) then align and twist the bottom of the disk assembly, from beneath the top, to brace it. The half-inch diameter hole in the center of the disk clamp holds your lamp securely while your work. This lamp clamp is made of Aluminum with a powder-coated finish, which makes it sturdy and strong for years of use. It attaches to a ½”- 1” table top or shelf.