Aluminum and light alloy anchors. Aluminum Fortress and Guardian Anchors - The best anchors in the world! Fortress brand anchors are produced from an alloy of magnesium and aluminum which make them very strong and resistant to corrosion. The components of these anchors are assembled by interlocking, without the need for welding that would weaken the metal. For this reason Fortress anchors are lighter and easier to handle and always offer the best grip on the seabed. Ideal for motorboats and dinghies. They are used as a second anchor on large yachts. The most purchased anchor is the Fortress fx 37 model. The Fortress anchor, built in reinforced aluminum and magnesium alloy, weighs less than a third of a galvanized steel anchor with 100% higher sealing thanks to its design. Easily removable and stowable, it is ideal as a sealing anchor for "flying" anchors. The Fortress anchors of the Guardian series, also produced by Fortress USA, are an excellent alternative to the heavier steel anchors. This Nautical anchor does not give up the basic qualities such as lightness and strength of the Fortress anchors, but the Guardian nautical anchor minimizes the options by providing an excellent variant at cheaper prices, while ensuring safety and reliability.