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A Pencil Compass and Scriber is also known as a Trammel. These tools accurately measure and mark distances too great for conventional compasses and dividers, and accurately transfer measurements, scribe arcs and lay out circles.
Wing nut assures easy assures easy and positive adjustment and at the same time locks the pencil securely. Points can be replaced with pencils, ballpoint pens, crayons or soap-stone sticks for marking various materials. Brass plated steel construction. Full-length hardened steel pin in metal frame for greater rigidity.