RUPP Marine Top Gun Backing Plate w/2.4" Hole - Sold Individually 2 Required. These backing plates work with any bolt-in Top Gun outrigger bases. Needed when top thickness is not sufficient to support outrigger bases or to provide a clean finished look. Sold individually. Specifications for RUPP Marine Top Gun Backing Plate w/2.4in Hole: Manufacturer: RUPP Marine Fabric/Material: Aluminum Size: One Size Color: Red Features of RUPP Marine Top Gun Backing Plate w/2.4" Hole Construction: Aluminum Package Contents: RUPP Marine Top Gun Backing Plate w/2.4in Hole RUPP Marine 17-1526-23: Top Gun Backing Plate w/2.4" Hole - Sold Individually 2 Required