hoop iron
noun
1.
iron in the form of thin strips for bonding masonry, holding barrels together, etc.
Origin
1810-20
Examples from the web for
hoop iron
Refiners had to pay high prices for barrels because
hoop iron
was high.
Philly armed him self with a heavy piece of
hoop iron
, and the two boys entered the vault, the youngest one carrying a lantern.