
If you are good at woodworking these will come in handy. I bought 2 packs of 4 to install in several different pre-drilled doors. These doors were purchased from different vendors at different times, but ALL the pre-drilled holes were the same. Latch (the part that sticks out of the door and mates with the door frame). It is slightly longer and larger than most pre-drilled doors. I had to turn around (1/16 inch) and drill a hole lower (1/2 inch) from the edge of the door to match the latch to the door. Also the outlet (the bottom of the doorknob connecting the two handles. The hole in the door also needed to be made slightly larger (about 1/8 inch diameter). FYI: This is also true of a few other brands that seemed very similar.

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