SeaSucker 4.5in SeaSucker Mount w/Flat-Top Stainless Steel D-Ring Black. 5in SeaSucker but with a stainless steel D-ring for holding ropes straps etc. Seasucker's vacuum cups lend themselves to an almost infinite number of uses. If you need to attach something to a rigid non-porous surface without drilling any holes this is the best way to do it. Specifications for SeaSucker 4.5in SeaSucker Mount w/Flat-Top Stainless Steel D-Ring: Manufacturer: SeaSucker Size: One Size Height: 4.5 in Width: 4.5 in Diameter: 4.75 in Package Contents: SeaSucker 4.5in SeaSucker Mount w/Flat-Top Stainless Steel D-Ring Protective covers SeaSucker VM1013B: 4.5in SeaSucker Mount w/Flat-Top Stainless Steel D-Ring Black