This dovetail Bit has a shank-mounted ball bearing guide for routing Dovetail slots following a template and pattern routing. The template must be mounted between the workpiece and the router. With a handheld router, the template must be on top of the workpiece. With a table-mounted router, the template must be underneath the workpiece., for pattern cutting or jigs, #45852, diameter (D) 3/4, angle (a°) 14°, cutting height (B) 3/4, shank (D) 1/2, overall length (L) 3, replacement collar 47739, replacement bearing 47721, flutes 2, Carbide Tipped Dovetail 14 deg x 3/4 dia x 3/4 x 1/2 inch shank with upper Bb