Ascender (climbing)
Juma}}An ascender is a device (usually mechanical) used for directly ascending, or for facilitating protection, with a fixed rope when climbing on steep mountain terrain. A form introduced in the 1950s became so popular it began the term "Jumar" for the device, and the verb "to jumar" to describe its use in ascending.
Ascenders can also be used as braking components within a rope-hauling system, often used in rescue situations. Provided by Wikipedia
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