These magnetic sign holders can be use to attach signage to a variety of metal surfaces. The mount is ideal on the sales floor because of its application versatility. These magnetic sign holders are ideal for visible placement signage. The mount is easy to attach to vertical, horizontal, square and rectangular tubing. The sign holder will be great for organizing the sales floor. Heres how the system works: 1) Choose size and style of frame that best suits your sign. 2) Decide which type of clamp will work best for your fixture: magnetic, spring, or C-clamp. 3) Complete the holder with the appropriate stem fitting and length.