Professional Review

"Make a circle with your square"

Most construction tasks consist of a series of straight lines, but occasionally you run into a situation that requires an arc or a circle. A trammel is usually the best tool for the job, but there’s only so much room in your toolbox.

M.Power makes the Tri-Scribe, which hooks onto tools you already have, like the tongue of a square or a metal ruler, and transforms it into a flat-lying trammel. Strike a circle or an arc from 1 in. to 6 ft.—you’re limited only by the length of your rule. You can either make your mark with a pencil or insert the knife blade and score the surface.

Best of all, they take up hardly any room in your toolbox.