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