Fortress Marine Aluminum Fluke Anchor Boat and marine experts all agree that Fortress Anchors set the industry standard as the Worlds Best Anchors. Their lightweight yet strong construction rate these anchors highest among marine anchors. Fortress Marine Anchors outperform heavier steel anchors yet weigh far less. Their precision manufacturing process makes them sharper than most conventional anchors, which allows them to penetrate the surface deeper and faster than most other anchors that weigh