|[ Sizes: Orig | Large | Med | Small | Thumb ]|
Sandstone is very soft, so no metal hardware is allowed. Climbers use loops with knots for protection. This particular knots are used as hexes, some smaller knots would be only a figure eight or just a simple overhang knot on loops of different thicknesses. They even use a small wooden pick to push it further inside the crack.
Image ID: 635449