Learn what rock climbing belay devices, such as GriGri and automatic belay equipment and gear you need to get started climbing rocks in these free rock and mountain climbing videos. Expert: Bill Killough-Hill Contact: www.zoaroutdoor.com Bio: Bill Killough-Hill has been teaching rock climbing at Zoar Outdoor since 1995 and is an AMGA certified top rope site manager. Filmmaker: Christian Munoz-Donoso