Dozens of doors--it never fails. Handles all common backsets and diameters. Do order the smaller-diameter spade bits for the edge bore. The standard 1" is a bit large for some lock fronts. 15/16" and 7/8" are available from boringjigs.com, Classic Engineering's website. Also available: carbide bits for cross boring.
The bits are actually driven by the drill via a quick disconnect adapter. You chuck up the adapter and then hook up to the bits, both of which have to mounted into the jig before you mount the jig onto the door. Get the adapter with the 1/2" shaft. The 3/8" shaft can do the job but there is a lot of torque cutting a 2-1/8" lock bore and the 3/8" adapter shaft can bend. The 1/2" adapter shaft is very stout.
This device works from the edge and one side. You don't have to bore from both sides of the door. Also, bore the edge bore to full depth first. That way there is less material for the 2-1/8" bit to remove and it goes faster.
I like to use my 1/2" Milwaukee Hole-Hawg drill. The two speeds and excellent power really go. High speed for the edge bore, low for the cross bore.
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