The Grigley is a brake-assisted belay device designed for use in both the gym and the rocky area.Compact and lightweight for use with single 8.5-11mm rope.Brake assist function provides greater control when handling belays, hang dogs, or stopping crash.The cam unlock mechanism on the handle allows for superior drop control.The way to pull out and stop crash is similar to common belay technology (never let the rope on the end end)