Add a second bit to your Kreg Case Qty: 4 300-Series Pocket-Hole Jig, or update any Kreg Jig to make working with 1/2", ", and 1 1/2" materials even easier. Features engraved markings for 1/2", ", and 1 1/2", and matchingEasy-Set Stop Collar. Material Thickness Gauge easily measures material thickness ( 1/2", ", 1 1/2"). A 1/4"hex shank fits all standard quick-change chucks. Compatible with all Kreg Pocket-Hole Jigs.