Kreg KRTCG100 Trim Router Circle Guide (Model Number: KRTCG100) is a router accessory that turns a trim router into a repeatable circle-cutting jig. This is a trim router circle guide designed for cutting accurate circles and arcs in woodworking materials when you need clean results without layout drift.

The big win is range and repeatability. With a circle capacity from 3-1/2 inches to 52 inches diameter, you can set the guide once and make matching parts without measuring the radius every time. The pin-hole setup supports interior and exterior diameter cutting, which matters when you are routing a disk to fit inside a recess or cutting an opening to match a specific outside size.

When you are not cutting circles, the guide still earns its keep as a larger base plate. The extra footprint adds stability and control for edge profiles, helping keep the router flatter on narrow boards so your roundovers and chamfers come out more consistent.

The base is built from impact-resistant polymer and it is clear, so you can actually see what the bit is doing and stay on your layout marks. An integrated handle gives you a more secure grip and helps reduce fatigue during longer routing sessions where you are walking the tool around a larger radius.

Compatibility is aimed at most major trim routers, including the Kreg 20V Ionic Drive 1/4 inch Trim Router. If you already run a compact router for hinge mortises, inlays, or small edge work, this is the accessory that opens the door to accurate circular routing without stepping up to a full-size router jig system.

If you cut circles a few times a year, this saves setup time and scrap. If you cut circles often, it is simply faster and more consistent than a homemade template, and it gives you a more stable base for everyday trimming work at the same time.

Kreg KRTCG100 Trim Router Circle Guide: big-circle capability from a small router

If you already own a trim router, this is one of the easiest ways to start cutting clean circles that actually land on-size.

• Who it's for: Woodworkers and remodelers who need accurate circles, arcs, or consistent round parts without building one-off jigs.
• Why it stands out: 3-1/2 in to 52 in diameter range, clear base visibility, and a handle that makes the tool feel planted instead of twitchy.
• Worth knowing: It is built for trim routers, so verify your router mounting pattern before you plan your project around it.

• What circle sizes can it cut? It is designed to cut circles from 3-1/2 inches to 52 inches in diameter.
• Can it be used for routing edges, not just circles? Yes. It can also be used as a larger base plate to add stability and control for edge profiles.
• What routers does it fit? It is compatible with most major trim routers, including the Kreg 20V Ionic Drive 1/4 inch Trim Router.