Fast, clean & non-destructive steel "finger locks" fit thin cracks from 1/8" to 1". Thread 2 feet of 1/2" tubular tie off web jamming the knot on the outside of the radius (old school) or get us to sew on a compact and strong Ultratape loop (extra $4.00). Clip a couple CAM HOOKS to each aider and shuttle up thin cracks with speed and efficiency, stoping only occasionally to place lead pro. Double up on mid sizes. Ed Leeper has retired and will not be making more CAM HOOKS... we will have replacement CAM HOOKS in Spring 09!