Often copied but never equalled, the Black Diamond ATC provides lightweight and durable belaying and rappelling performance anytime, anywhere. It 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. Unique, smooth-handling geometryMinimalist design is durable in all conditionsLarge surface area dissipates heat when lowering or rappellingHandles ropes from 7.7 to 11 mm