Milescraft 45° Finish Trim Jig

It is a trim carpentry aid for marking and measuring finish trim — ideal for installing door and window casement trim and decorative projects like fireplaces and bookshelves — without calculations or a helper.

The Trim45 has an adjustable reveal setting from 1/8" to 1/2" in 1/8" increments, so it adapts to virtually any trim project.

Tape-measure slots and rare-earth magnets let you measure jamb openings and trim stock by yourself, eliminating the need for a second person to hold the tape for perfect miter cuts.

The jig has a 45-degree angled head for marking miter cuts accurately every time.

Yes. A built-in clamp pad is designed to work with any clamp, holding the jig steady while you mark. See our clamping tools.

A push-lock button securely sets your chosen reveal accurately each time, so the setting stays consistent across every piece of trim.

The jig is made of plastic and weighs just 0.3 lbs, making it light and easy to carry around the job site.

It is made by Milescraft. You can find it among our joinery jigs and trim aids.

It excels at installing door and window casement trim, as well as decorative trim work such as fireplaces and bookshelves — anywhere you need accurate miter measurements. Pair it with our router jigs & guides.

The rare-earth magnets help hold a tape measure in place against the jig so you can take accurate measurements of openings and stock single-handedly, for repeatable miter cuts.