Expand the capability of your Kreg Pocket-Hole Jig 310 or 320 by adding another drill guide to drill more holes, plus a spacer that fits between the guides for more hole-spacing options. The Pocket-Hole Jig Expansion Pack includes 1 hardened-steel drill guide with thickness stops for 1/2 in., 3/4 in., 1 1/2 in., so you can 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 Jig Spacer that provides more pocket-hole spacing options by simply positioning the spacer, and then twisting the drill guides to lock them in. Like all Kreg drill guides, this 1 comes with a lifetime warranty, so you know you'll get the years of performance and value you expect from the #1 pocket-hole brandKreg. Material: Nylon.