This is the Dive Rite Backplate Single Tank Adaptor Stainless Steel with Hardware Features: Marine grade 304 stainless steel Dimensions: 13-in x 3 3/8-in (33 cm x 8.5 cm) Weight: 13 oz (.37kg) Re-sized to fit squarely in the opening of Dive Rite Travel and Voyager series wings Includes two rubber non-slip cam strap pads and all hardware required to mount to a backplate For divers who frequently switch between double tank and single tank rigs, the Dive Rite single tank adapter is a convenient way to attach cam straps to a hard metal backplate that does not have tank band slots. Includes two rubber non-slip cam strap pads and all hardware required to mount the adapter to a backplate.