KATA 1-3/8" - 1-3/4" Door Lock Installation Kit for Wooden Doors with Guide Template,Door Lock Hole Saw,Carbon Steel

This worked perfectly. I rebuilt an old leaded glass door and had to flip the sides of the hinges and knob. This allowed me to perfectly drill out the holes for the knob and plunger. You still have to take care to ensure you’re hold the drill flat and level, but it made the process very easy. The only issue is that I had to drill a small center guide hole for the plunger to ensure the hole saw was precisely aligned, but that just took a minute or so. This is an excellent tool and very reasonably priced at only about $10.

I was doing this for the first time as a DIY and the results turned out better than I had expected. There are some concerns when using it such as the hole guide being wobbly if you are using the guide extended. I extended the guide to 2-3/4" backset and there really is no locking mechanism (at least that I could see via instructions), so preferably pre-drill the center point before going straight in to avoid misplacement. The hole saws worked well but I do see them not lasting if you are doing a lot of doors. As some have mentioned also, make sure you double check and measure that its centered because it doesn't exactly fit flush, and sometimes has gaps on both sides. I won't fault the product though because it got the job done.

Perfect for door locks drilling correct size.I am happy

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Haven’t used this as yet but seems to be of good quality.