The Big Horn 19665 5/8 Inch Brass Router Template Guide is an excellent accessory for guiding your router with controlled cuts using a template or specific pattern. It attaches to the router base, maintaining a precise distance from the template's edge while cutting the workpiece pattern. Perfect for precision routing, it is ideal for routers with a 1-3/16” base plate opening. Manufactured from precision-machined brass, it ensures accuracy and durability for your woodworking projects. Compatible with Porter Cable-style router subbases with a 1-3/16" diameter center hole, including models from Bosch, Metabo, Milwaukee, DeWalt, and more. Ideal for stair routing, pattern and hinge routing, dovetailing, arts & craft hobby work and other general template operations.