Locks that are used to secure tripod/monopod legs when they are part or fully extended.
Quick-release clips are the most popular type of leg lock used as they allow rapid
adjustment of the tripod height. Tripods with several leg sections have a lock
on each section.
Leg locks tend to be used regularly and are often on the outside of the legs so they
can be more vulnerable to damage. Metal locks are the best as plastic can break
if handled without care.