Defender Security U 9977 Non-Recessed Door Reinforcer with 2-3/4-Inch Backset by 1-3/4-Inch Thick, Brass Finish Solid brass construction Fits a 1-3/4-Inch thick door, 2-3/4-Inch backset, 6-Inch hole spacing. Top hole bore size 1-1/2-Inch, bottom hole bore size 2-1/8-Inch Protects against forced entry Easy to install Reinforcer edge type: non-recessed