AN Fittings are used on street and racing applications. NGR Performance AN Fittings are made of 6061 Billet Aluminum. Anodized for strength and durability in sleek Black color. NGR AN Fittings are universal application and completely reusable. NGR AN Fittings are anodized black and are available in 4AN, 6AN, 8AN, and 10AN with straight, 45, 90, and 180 degree angles.