Greenfield Products Coated Navy Anchor – BlueThe Navy Anchor is a classic, proven design, which has been in use on large vessels and warships for over 100 years. Navy Anchor performance comes from the combination of weight and mechanical principle. Like all fluke anchors, chain is recommended for proper performance.ModelWeightRecommended Boat Size In Winds Up To 30 KnotsChain (Recommended)Scope (Line Feet: Depth Feet)910-R10 lbsUp to 14 feet1/4″ x 4’7:1915-R15 lbsUp to 18 feet1/4″ x 4’7:1920-R20 lbsUp to 24 feet1/4″ x 4’7:1