The COR Ceiling Rack is great for paddle boards, surfboards, long boards, kite boards, wake boards. It's made of durable galvanized steel with a protective cover to keep your board safe and ding free. Store your Stand-up-paddle board overhead! Utilizing a 180 degree bend the COR Ceiling Rack securely stores and displays your Stand-Up Paddle Board to the ceiling without complicated straps or cables. The rack opening is 10-1/2”. The COR ceiling rack will hold any size SUP. Easy to install. Set includes two arms, screws and easy-to-follow instructions. 3/8" Inner top top inner bottom: 10"