In 1986, Don Hallerberg, a boater and engineer, brought the lightweight Fortress anchor to market. Today, Fortress is perhaps the best-known brand of Danforth-style anchor. Featuring adjustable flukes, the Fortress is machined from aluminum to make it very light and durable (there are no welds to break). Another benefit is its versatility. The standard angle on the flukes of a Danforth is 30 to 32 degrees, optimal for most conditions. However, in soft, muddy bottoms, a steeper angle makes for quicker, more secure sets. For these conditions, the Fortress's adjustable flukes can be set at 45 degrees.