For use on interior or exterior wood or metal doors 1-3/8 to 1-3/4-inch thick. Latch size 1 x 2-1/4-inch with square corner faceplate, 3/4-inch housing diameter and 1/2-inch throw. Backset is adjustable for 2-3/8 to 2-3/4-inch, T-Strike size 1-1/8 x 2-3/4 x 3/32-inch. Use 2-1/8-inch diameter hole for knob and 1-inch diameter hole for latch bolt. UL Listed, 3-hour fire rated and 1-year limited warranty.