Black Diamond ATC Belay / Rappel Device Often copied but never equaled, the Black Diamond ATC provides lightweight and durable belaying and rappelling performance anytime, anywhere. This classic design features a large surface area that dissipates heat when lowering or rappelling, and the smooth-handling geometry accommodates rope sizes from 7.7 mm to 11 mm. The ATC can now be ordered in specific colors.ATC Belay/Rappel Device FeaturesUnique, smooth-handling geometryMinimalist design is durable in all conditionsLarge surface area dissipates heat when lowering or rappellingHandles ropes from 7.7 to 11 mmAvailable for order by individual color