Double 21 are used on many of todays popular metal blade lures. These doubles can be used as replacements on blades as well as used on just about any type of hard body needing some extra snag resistance. Double 21 hooks can be used to get lures into places too snaggy for traditional treble hooks. They also can be used for Bream, Bass, Mangrove jacks or any other species hanging on rough bottom or deep inside snags.