Before buying, read the reviews on this tool. Apparently many had difficulty removing the cylindrical cutting wheel from the mandrel when switching between two different bit sizes. I replaced all the doors in my house with solid oak paneled doors, so I bought a separate frame for the second hole saw. First I drilled half a hole for the bolt and then loosened it from the drill and left it in the door. This allowed me to then drill a hole for the locking mechanism, using the smaller hole saw as an anchor to hold the tool in place. After the big hole was drilled, I finished drilling the smaller hole. Fits perfectly in all my doors. The bits wear out over time, but I haven't noticed any wear on the tool itself after 18 doors.
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