Black Diamond ATC Guide One device to do it all, the new hot-forged ATC-Guide is a truly full-function belay device offering the most versatility of any device on the market—dual-friction belay and rappel modes and a Guide Mode for belaying one or two seconding climbers. In Guide Mode it locks if someone falls. Plus, due to the unique release point, you have the ability to lower a climber regardless of weight differences between the climber and belayer. Capable of handling ropes from 7.7 mm to 11 mm in a variety of adverse situations. Features: High Friction Mode for greater control and holding power Regular Friction Mode for normal climbing and rappelling In Guide Mode it locks if someone falls & has lowering capabilities Unique release point built into the unit