This dovetail system works with precision bearing guides on the shank of the router bit instead of using those hard to center brass bushing guides. Since the bearing is already centered on the bit, it makes setting up to cut the joint fast and easy. We have milled the aluminum template to match the bearing size so that the bit is perfectly centered and there is no slop, no wear and no waste. Unlike other templates you have seen, our jig will work with two different thicknesses of stock. It also does not limit your stock width, it's as simple as making your first cut, then slide the jig down, realign and make your second cut. You can also attach a second Dovetail Wiz with tabs (sold separately) and make the longer width cuts all at once without moving the jig.