Top Support Bracket - Rail Mount 1 Rail - 2-3/8 MastWith Edson's Rail Support Bracket for 2-3/8 Standard Radar Mast - 1-inch Railing is designed to give any Edson 2-3/8" Radar Pole more support, comes complete with two Stainless Steel U-Bolts and two Starboard Rail Mount Brackets to provide a secure, rattle-free installation. Must be mounted within 1" of the railing. This Surface Mount gives you the ability to support the mast against a bulkhead, cabin side or vertical transom.