Ceremonial Fire Drill

Ceremonial Fire Drill is a collectible relic found in Shadow of the Tomb Raider. It is part of the Cult of Kukulkan collection, located in The Hidden City.

Information
''This garishly decorated fire drill appears to be a part of the New Fire ceremony, an Aztec celebration of the new year. It consists of five days of fasting, bloodletting, and sacrifice. The fire drill is meant to be placed upon the chest of the freshly sacrificed. It sparks, feeding a large bonfire that ignites the flames of every nearby temple.''

Inspection
This one, however, doesn't appear to have been used, as the notches are clear of blood.