Add a second bit to your Kreg® 300-Series Pocket-Hole Jig, or update any Kreg Jig to make working with 1/2", 3/4", and 1-1/2" materials even easier. The bit features engraved markings for 1/2", 3/4", and 1-1/2", and matching Easy-Set Stop Collar. Thickness Gauge Hex Wrench easily measures material thicknesses from 1/2" to 1-1/2". 1/4" hex shank fits all standard quick-change chucks. Compatible with all Kreg Pocket-Hole Jigs.