Size Information: the security door reinforcer fits 1-3/4 inches thick doors, This item accommodates key-in knob locksets on doors that have 2-1/8 inch bore sizes with a backset of 2-3/8 inch The width of this door guard is 4 inch and it is 4-1/2 inch tall. Door Reinforcement Plates Set: you will receive 4 pieces of door reinforcement plates in silver color, which help to reinforce and repair the door lock, and improve the security of the door lock, prevent forced entry by reinforcing the weak spot of an entry door with the recessed door lock reinforcer; Stainless Steel Material: the door lock plate adopts stainless steel material, sturdy and strong, waterproof and rustproof, which can be applied to reinforce the weak points on the door and repair these places, thus strengthening the door lock solidity and ensuring a solid door lock Applicable Occasions: the door security plates can be applied on wooden or metal doors with deadbolt or drive in latches, also suitable for keyed knob, latch or combination locks; They are very suitable for you to regularly repair your door locks, such as bathroom, kitchen, living room and other doors Easy to Install: the metal door plate is easy to install, All installation fasteners are included with this item, you can measure the door hole distance before purchase, remove the lock cylinder and handle, match the door seal to the door lock hole, fixed with screws, and then install the lock cylinder, Color: Silver Material: Stainless Steel Package Contents: 4*Door Guard Reinforcer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.