These puppies are big! For fist crack and offwidth aficionados, Bigbros rule. The expanding tube chock design is stable, lightweight, easy to use and strong. Because of their fixed nature when they're placed correctly they're almost impossible to dislodge when you're grunting by them, and they make a nice smooth rope guide at the lip of a roof. Their expansion range is phenomenal--a #4 BigBro has greater range than an entire set of traditional cams. Known affectionately around the BCG shop as "crack pipes."