Review: Click-Up Belay Device - Black Sheep Adventure Sports
Steel D twistlock captive karabiner
RP420 Keeloc SmartSnap Belay Device for self-belay around a Ropes Course
REVERSO®, Versatile, lightweight belay/rappel device, for use with one or two rope strands and ability to belay a second climber from the anchor - Petzl Other