A belay device is a tool used by climbers to give them the adequate mechanical advantage to hold the weight of another climber.
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History
Early climbers belayed a leader with a body belay. (more stuff to go here)
Plate belay Devices
Info here
Tube Belay Devices
Through info here.
Auto-Blocking Devices
Petzl Reverso, Trango B52, Black Diamon ATC-Guide, Kong Gi-Gi, Salewa Guide.
Auto Locking Devices
Petzl Gri Gri, Trango Cinch, Faders Sum, Edelrid Eddy