A Double Bore Stainless Steel Wrap Around Plate repairs, reinforces and protects wood or metal doors from forced entry. Compatible with key-in-knob lockets or deadbolts. 2-1/8″ Top Bore, 2-1/8″ Bottom Bore 3-5/8″ inch Between holes 2-3/4″ inch Backset For use on 1-3/4″ inch thick doors Size 4-1/4″ x 9″ inch Residential, commercial or industrial use 0.