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A doweling jig holds a drill guide at exactly the right position to bore a hole at a precise location on the edge or face of a board. It ensures that holes in mating boards align perfectly when the joint is assembled, which is critical for flush edge joints, shelf pin holes, and frame-and-panel assembly.

The most commonly used dowel diameters in furniture and cabinetmaking are 1/4 inch, 3/8 inch, and 1/2 inch. Smaller diameters are used for alignment in thin stock or narrow edges; larger diameters carry more shear load. Infinity Tools Premium Dowels are available in multiple sizes to match your jig and project needs.

The Self-Centering Dowel Jig has two movable jaws that open and close symmetrically, automatically positioning the drill guide in the center of whatever board thickness is clamped between them. This eliminates layout steps and ensures mating holes are always centered on the same axis.

Yes. The 5-Piece Extra Long Dowel Plug Cutter Set cuts dowels and face-grain plugs directly from your own scrap wood, allowing you to match the species and grain of your project for invisible repairs or decorative pegging.

Dowels are round cylindrical rods that fit into drilled holes and provide both alignment and shear strength perpendicular to the joint. Biscuits are thin oval wafers of compressed wood that fit into slots cut by a biscuit joiner; they provide alignment and some shear resistance but rely more on glue area. Dowels generally provide more mechanical strength for structural joints.

A handheld drill works well when used with a doweling jig, since the jig guides the bit straight into the work at the correct angle. Without a jig, getting perfectly plumb, parallel holes freehand is very difficult. A drill press adds even more accuracy for production work but is not required.

The spiral grooves machined into commercial wood dowels serve two purposes: they allow excess glue to escape the bottom of the hole as the dowel is driven in (preventing hydraulic lock), and they increase the surface area covered with glue for a stronger bond.

The JessEm Dowel Jig Master Kit includes adjustable hole spacing guides, multiple bushing sizes, and a comprehensive set of accessories for tackling a wide variety of joint configurations. It is a more capable, production-oriented system compared to a simple self-centering jig.

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Beyond dowel joinery, our dovetail joinery collection includes Leigh jigs and Infinity Tools router bits, and our finger joint joinery section has cutters and bits for box joints. The complete Cabinetry & Joinery collection covers pocket-hole systems and more.