Metal Fastener on a Belt
Puzzle 3 of Emergency Workers Easy Pack
Question is: Metal Fastener on a Belt
and the answer is: BUCKLE
Word Meaning:
BUCKLE — A metal clasp with a hinged tongue or a spike through which a belt or strap is passed and penetrated by the tongue or spike, in order to fasten the ends of the belt together or to secure the strap to something else.
Definitions from Wiktionary.