Add a second bit to your Kreg 300-Series Pocket-Hole Jig, or update any Kreg Jig to make working with 13mm, 19mm, and 38mm (1/2 , 3/4 , and 1-1/2 ) materials 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 bit works with materials from 1/2 to 1-1/2 thick, and features engraved markings for 13mm, 19mm, and 38mm (1/2 , 3/4 , and 1-1/2 ) along with the matching Easy-Set Stop Collar. The Material Thickness Gauge allows you to easily determine material thickness 13mm, 19mm, and 38mm (1/2 , 3/4 , 1-1/2 ) easily, too. A 6mm (1/4 ) hex-shank fits all standard quick-change chucks. Compatible with all Kreg Pocket-Hole Jigs.