Cross Dowel Jig for use with #10 or 1/4in inch bolts and matching cross dowels. Requires 1/4in and 7/16in drills. Cross dowel joints are the strongest knock-down joinery in use today and Woodpeckers new precision machined cross dowel drilling jig makes using cross dowels easier than ever. No more costly misaligned holes or incorrect spacing. It features solid aluminum body with stainless steel guide bushings. With this simple drill guide and two drill bits you'll be able to drill both holes in perfect intersecting alignment. The Woodpeckers drill guide features two screw length offsets for different dowel locations, 3/4in and 1in. Keep in mind that the thickness of the panel will influence what lengthy screw to use. For instance if the panel is 3/4in thick and you'll be using the 1in offset, you'll need a screw at least 2in long. Properly created cross dowel joints have incredible clamping force and great shear strength. They can be made with standard hardware as well as cosmetically professional looking connector bolts in a variety of finishes. Made in U.S.A.