6' x 5/8" brick mason wood rule. Used by bricklayers. Graduated vertical inches to 1/16ths, both edges. Brick mason scale on inside, red course counters numbered consecutively. Regular outside markings in black.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.