Add a second bit to your Kreg 300-Series Pocket-Hole Jig, or update any Kreg Jig to make building wood projects with boards and plywood even easier. The Kreg Easy-Set Pocket-Hole Drill Bit with Step Collar and Gauge/Wrench is the same stepped bit that comes with 300-Series Kreg Pocket-Hole Jigs. This drill bit works with materials from 13mm to 38mm thick, and features engraved markings for 13, 19 & 38mm, along with the matching Easy-Set Stop Collar. The Material Thickness Gauge allows you to easily determine material thickness from 13mm to 38mm easily, too. A ¼" hex-shank fits all standard quick-change chucks. Compatible with all Kreg Pocket-Hole Jigs.