Roswell 360 Adjustable Rack Adapter The Roswell 360 adjustable rack adapter is designed to provide 360 rotational mounting positions for fixed rack mounts. Constructed from machined aluminum that has bee sandblasted for longevity in marine environments. The included plastic inserts are designed to fit square and round tubing 1″ – 2.5″ in diameter. Product Features: 360 Rotational Mounting Positions Saltwater Friendly Compatible with Fixed Racks Only Fits Tubing 1″ – 2.5″