Cam Hooks are used to smoothly make quick progress up cracks. The use of applied leverage transfers bodyweight into holding force against the rock. Place protection pieces as if you are free climbing. Climb past funky placements with clean "finger locks" of metal. The over-bent hook has a subtle hourglass-shaped tip that locks into cracks and pin scars. Smooth surfaces around webbing tie-off hole reduces webbing wear. Patterned after Ed Leeper&';s amazing design. Sling with 9/16" supertape or 1/2" tie-off webbing. If using the 9/16" supertape, cut the webbing with a 45 degree angle to make it easier to feed through the tie-off hole. 1/2" tie-off webbing allows more versatility on how the sling is oriented. If using 1/2" tie-off webbing, inspect the webbing frequently - It can wear out quickly. SPECIFICATIONS: a MICRO:- Heat-treated 4130 chrome-moly steel Thickness = (1/8") 0.125" Laser-cut shape Tie-off hole = 3/8" (0.375"); chamfered Weight = 21 g / 0.74 oz. a NARROW:- Heat-treated 4130 chrome-moly steel Thickness = 5/32" (0.160") Laser-cut shape Tie-off hole = 3/8" (0.375"); chamfered Weight = 59 g / 2.08 oz. a WIDE:- Heat-treated 4130 chrome-moly steel Thickness = (1/8") 0.125" Laser-cut shape Tie-off hole = 3/8" (0.375"); chamfered Weight = 63 g / 2.22 oz. a FRAGILE FLAKE:- 7075-T6 aircraft grade aluminum Thickness = 3/16" (0.190") Laser-cut shape Tie-off hole = 3/8" (0.375"); chamfered Weight = 49 g / 1.73 oz.