General Tools & Instruments. The EZ Pro Dovetailer Dovetail and Box Joint Jig lets users create through and half-blind joints. The self-aligning design ensures that dovetail joints will match up evenly, the maker says, and the dovetail interference can be adjusted for loose or tight joints. A portable, freestanding design and integrated clamps let users attach the jig to the workpiece without the need to bolt it to a workbench. The aluminum jig accommodates boards of any width and comes with one 14-degree 1/2-inch dovetail router bit. 800.697.8665.