Metal Router Circle Cutting Jig with Measurement Scale and Adjustable Knobs

This woodworking tool is a metal positioning ruler designed to work with a milling or trimming machine, giving the setup a stable reference for repeatable layout and alignment. It functions as a circle cutting guide with a central round opening and slotted top plate, helping guide the machine in controlled circular work. The milling machine guide ruler includes a long, horizontal sliding crosspiece, and multiple adjustment knobs so the working position can be set and locked with precision. Clear printed or engraved ruler markings run along the slim straight body, making this trimming machine guide easier to read when measuring and positioning. Built to support accurate work on the bench, this guide helps reduce trial-and-error during routing and shaping, making setup more consistent for detailed woodworking tasks.