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Time-tested passive Pro, stoppers are a Direct Link to the original chocks that started the clean climbing revolution. Black Diamond stoppers are an essential for every trad rack, designed with a transverse Taper that permits sideways placements in flares and shallow seams. Anodized by size, they're quickly identifiable and rounded edges make for easy removal. Each stopper is equipped with a durable, galvanized steel cable. Time-tested passive Pro for everything from granite walls to quartzite cragging-stoppers are the descendants of the original chocks that started the clean climbing revolution.