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DMM - Big Boa HMS
(Get this price if shipping outside EU)
DMM's giant locking 'biner - great for building belays or any other time when you may want to get a couple of clove hitches on a single biner.
Various gate options are available with screw gates (yellow barrel) being the most popular.
Quick lock (red barrel) is DMM's double action gate, a single twist and the gate is able to open. Lock safe (green barrel) is DMM's most secure, triple action, gate design requiring a twist and lift before the gate is able to move open.