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This 180 degree hinge can be installed quickly without any welding. The BOLTON-HD-4D offers the same advantages as the Locinox GBMU hinge-line: vandal protection; a lot of adjustability (height, depth, and gap between gate and post); one part fits left or right handed gates. BOLTONHD-4D is available in M12 and M16, and always in 2 versions: one with Quick-Fix on both sides and one with Quick-Fix on the post, and on gate side a bolt through fixing for gate frames from 1.6" to 2.4".