Five Oceans Mounting Bracket for Ring Buoy, Rail Mount/Flat Mount Type: Rail Mount Ring Buoy Mounting in flat surface or tubes (7/8" & 1") Nylon Strap Dimension: 6" x 6" x 2" Inches Rail Mount Aluminum Ring Buoy Material: Stainless Steel Mounting in flat surface or tubes (7/8&#034; &amp; 1&#034;) Nylon Strap Type: Buoy &amp; Fender Holder