Greenfield Products Coated River Anchor - Blue The Tri-Fluke design of the River Anchor allows the flukes to penetrate the river bottom in soft and moderate conditions, or to 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. Larger models are preferred choice for pontoon boats and other difficult to hold boats. Tri-fluke design recommended in softmoderate conditions PVC coated anchor Recommended chain 14