I purchased this product to install in my home's front door. The home is 34 years old and the current front door lock does not have a bolt with a flange and 2 screws. The instructions show both types of bolts but only the flanged bolt is provided and there is no instructions within the packaging about what to do. I finally found on the Kwikset website that I am supposed to contact Kwikset (only normal office hours and not weekends or nights) and ask for this bolt. If it is not sent free to me then I will take the item back and buy something else. I think the outside of the box should indicate that the other bolt will have to be obtained later and is not inside the box.