Wichard Medium Anchor Swivel 5/16" - 1/2" [2976W]Medium Anchor Swivel 5 16" 1 2" Wichard anchor swivels are designed to simplify anchoring operations, especially when hoisting the anchor. Their unique design ensures that the anchor automatically aligns itself correctly in the bow roller, even if it comes up in the wrong orientation. The Medium Anchor Swivel suits 5 16", 3 8", and 1 2" (8mm, 10mm, and 12mm) anchor chains. Features: Anchor chains from 8mm to 12mm Self aligning to the bow roller