High tempered aluminum with a buffed finish. Deep graduations. Includes lumber scale with board feet equivalent, decimal equivalent table, metric conversion table, formula for squaring a foundation, volume and area formulas, wood screw gauge table, nail sizes, depth scale, 1/8″ graduations front and back, plus 45, 60, and 30 angle markings. Body 24″ x 2″. Tongue 16″ x 1-1/2″.