All the awesomeness of the basic 4.5? SeaSucker, but with a flat-topped stainless steel D-ring for holding ropes, straps, etc. Rounded D-Ring — General Purpose Smooth, versatile attachment point for straps, hooks, carabiners, and everyday gear. Pointed D-Ring — Secure Tie-Down Designed to help keep straps and hooks centered for a more secure, controlled connection.