Climbing hold - online puzzles

A climbing hold is a shaped grip that is usually attached to a climbing wall so climbers can grab or step on it. On most walls, climbing holds are arranged in paths, called routes, by specially trained route setters. Climbing holds come in a large array of sizes and shapes to provide different levels of challenge to a climber. Climbing holds are either bolted to a wall via hex- head bolts and existing t-nuts or they are screwed on with several small screws. In extreme cases, concrete anchors may be used ( if putting holds on the underside of a bridge, for example).