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.