Greenfield Navy Anchor 15 Lb. Black. Navy anchors are designed for this purpose. Greenfield produces fluke anchors in several designs so they can be used in many different types of conditions. Anchors made of carbon steel have a black no-mar plastisol coating. Carbon steel has been proven to be more impact resistant than other metals. All Navy anchors have a powerful hammer claw which digs in quickly and holds strong when it strikes bottom. Features of Greenfield Navy Anchor 15 Lb. Recommended Boat Size (in winds up to 30 Knots): Boats Package Contents: Greenfield Navy Anchor 15 Lb. Greenfield 915B: Navy Anchor 15 Lb. Black