base box

noun
  1. a unit used in the sale of tin plate, equal to the total area of 112 sheets each measuring 14 by 20 inches (35 by 50 cm), or 31,360 square inches (196,000 sq. cm).

Origin of base box

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018