Features:· 100% Brand new & High quality · It provides an extra security and convenience for you and your family · Installation is simple and convenient, users can install it by themselves · Fit any door whose thickness is 45-75 mm or 75-105mm   Package Content: · 1 X Metal Cat Eye with lid   Tips: · Dimension measurement method: need to measure the diameter of the opening on the door, the size of the door (door depth) · Do not measure the size of the old cat's eye. If the cat's eyes are still on the door, remove it first. If the original door is not yet open, measure the thickness of the door.