Black Diamond ATC Belay. As seen at crags and on climbing walls up and down the country, the BD Air Traffic Controller is a modern day classic. Simple, lightweight and smooth feeding, the ATC belay/rappel device is easy to operate and, when used correctly, won’t kink your rope. Designed for 7.7-11 mm cords and to hold falls more easily, its extensive surface area dissipates heat effectively when lowering or rappelling.

    

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