Petzl Skyhook, Small radius progression hook. Petzl USA. This larger size has a wider radius head than the smaller size, making it able to sit over larger features. Petzl's Sky Hook has been synonymous with aid and big wall climbing for decades, and many a tall tale hits its climax when the teller says "I was standing on a hook, 20 meters above my last piece of pro" Petzl Sky hook availiable in 2 sizes, large and small - see photos. Petzl Skyhook Aid climbing hook, for progression or positioning. Petzl SkyhookAid climbing hook, for progression or positioning. Suitable for hooking on a variety of rock features and holes. . Use on edges is aided by leg geometry to provide stability. Orders for in-stock products placed by 2:30 PM on weekdays are dispatched the same day. Petzl Skyhook Aid climbing hook, for progression or positioning. The Petzl Sky Hook is a medium sized hook with a fairly narrow nose making it good for hooking over small flakes and into narrow pockets. For use in body-weight only applications for positioning. Nylon tape attached. Description Petzl Skyhook Aid climbing hook, for progression or positioning. jipw, yd, 5hnu, 5sr5, bg9a, tigasv, nvf5fp, u03b, uh5xq, foyt0k,