Expand the capability of your barrel pocket hole jig by adding another drill guide to drill more holes, as well as a spacer that fits between the guides to allow more hole spacing. The pocket hole expansion pack includes a hardened steel drill guide with thickness stops for 1/2", 3/4", 1.5", allowing you to add a second guide to your pocket hole jig 310 or add a third to the pocket hole jig 320. This kit also includes a pocket hole spacer that provides more pocket hole spacing by simply positioning the spacer and then rotating the drill guides to lock them. Like all Keg drill guides, this one has a lifetime of life, so you know you are getting the years of performance and value you expect from the #1 pocket hole brand.