Tri-fluke cast iron design recommended in soft/moderate conditions and for medium duty. The Tri-Fluke design of the River Anchor allows flukes to penetrate in soft and moderate conditions and engage rocks and structure in rivers and current. The river anchor is a great all-purpose anchor for lighter craft, or a great second anchor. Designed to hold boats under 4.9m. Weights vary due to metal and coating content. Listed weights are approximate.