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.