Just add a buoy, snap and short line. To retrieve an anchor, place ring over the anchor line securing it to the buoy with the line and snap. Toss the assembly in the water and run boat at a 45 degree angle from the anchor. The ring and buoy will be forced down over the shackles, chain and fluke releasing the anchor from the bottom and floating it to the surface. Great to keep onboard in case of an anchor windlass failure. 5.5" diameter stainless steel ring.