Protection Devices
Protection devices, collectively known as rock protection or pro, provide the means to place temporary anchor points on the rock. These devices may be categorized as passive (e.g., nuts, Hexentrics, etc.) or active (e.g., SLCDs and some uses of tricams). Passive protection acts "merely" as a choke when pulled on, and constrictions in the rock prevent it from pulling out. Active protection transforms a pull on the device into an outward pressure on the rock that helps the device set more firmly. The type of protection that is most appropriate varies depending on the nature of the rock.
Read more about this topic: Rock-climbing Equipment
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