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Black Diamond - Gridlock
(Get this price if shipping outside EU)
Brand: Black Diamond
Black Diamond's answer to preventing cross-loading on belay carabiners.
An additional protrusion on the gate means that once on the belay loop the Gridlock can not rotate and cross load across the weaker axis of the 'biner.
More recently they updated the Gridlock with a Magnetron closure which is ideal for the safety conscious (or forgetful!).