DisplayImporter Adjustable Rack Mount Plastic POP Sign Holder Clip with Detachable 3.5'' Stem - Pack of 10 8'' L x 3.1'' W Clamp fits tubing up to 1 inch in diameter. Sold in pack of 10 holders. The 3.5 inch stem (ball and socket joint) can be removed to shorten the sign holder to 4.5 inch long. Simple sign display is perfect as table tents, menu holders, and photo and retail displays. Placing promotional graphics, ads or a logo on a sign holder instantly gives it importance and places it in the direct view of your customers.