Hard Hat Area is a mythic Artifact — Contraption card from Unstable (UST), collector number 187. Current market price: $0.40 (foil $3.99), TCGplayer market prices via Scryfall.
Whenever you crank this Contraption, roll two six-sided dice. This Contraption assembles a number of Contraptions equal to the difference between those results. (To assemble a Contraption, put the top card of your Contraption deck face up onto one of your sprockets.)