Water & Wood Home Metal 200 Degree Wide Angle Door Viewer Peephole

If you don't know what a peep hole is, it's a fisheye lens it shows you a wide field of vision so you can see who's outside your front door. If you hang things like wreaths, you want to take that into account so we're putting this high enough to see through the wreath and at the right height for the home occupant. You don't want to place it so that the person living in the home has to get on a stool if they're not very tall. This is one I'm going to install. It's two parts and as you can see there's not much room for error. See the lip at the top and the bottom if I drill the whole the wrong size it's going to show so I have to make sure the hole I drill is the exact size. I found the mark to be made on the inside of the door of how high we want it to be and I'm just looking to the other side, I can see both sides of the door at the same time if I stand in the middle of it and use a rul