Black Diamond Gridlock Screwgate Carabiner Gray. Specifications for Black Diamond Gridlock Screwgate Carabiner: Manufacturer: Black Diamond Carabiner Size: Standard Condition: New Fabric/Material: Aluminum Carabiner Type: Locking Biner Features of Black Diamond Gridlock Screwgate Carabiner Small internal wiregate eliminates cross-loading Horned spine keeps belay device in place Package Contents: Black Diamond Gridlock Screwgate Carabiner Black Diamond BD2101641003ALL1: Gridlock Screwgate Carabiner Gray