Extreme Marine Products Arnall's Laser Arch Support System for Pontoon Covers-5 Sets To see other styles of Arch Support Brackets, search "Pontoon Arch" Railing must be 1.25" square and accessible from all sides Includes 5 Sets of Laser Cover Arsh Support Brackets U.S. Patent No. 7555994 Comes With Instructions-Plus Steps to Winterize and Strengthen