Five Oceans Mounting Bracket for Ring Buoy, Rail Mount/Flat Mount MADE from AISI316 Stainless Steel Marine Grade MOUNT Type: Surface (Flat Mounting) MOUNTING Hardware: 1/4" Fastener (2) (Not Included) CRADLE sits open at 5-1/2" to fit any ring buoy Material: Stainless Steel Mount Type: Surface Type: Buoy &amp; Fender Holder Mounting Hardware: #1/4 Fastener (2) Cradle sits open at 5-1/4 to fit any ring buoy