Metal Link Used by Rock Climbers
Puzzle 12 of Radio Station Medium Pack
Question is: Metal Link Used by Rock Climbers
and the answer is: CARABINER
Word Meaning:
CARABINER — A metal link with a gate that can open and close, generally used for clipping ropes to anchors or other objects or for slinging gear (equipment) on one's person.
Definitions from Wiktionary.