The Takeaway: Diablo’s Impact Strong Step Drill Bits are a fast, convenient way to drill holes from 3⁄16 of an inch to 1-1⁄8 inches without having to swap bits.While they can drill many ...

If this happens, remove the drill and move to a different spot or drill a few inches lower. The typical drilling depth for horizontal boring under both sidewalks and driveways is 6 to 8 inches.