Classic Engineering 10800 Review: Classic Engineering 10800 Boring Jig Kit. 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 ... Read more »
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