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Polished aluminum trammel points, 3 14 in. x 38 in., for cutting and scribing circles and arcs. This lightweight compass fits a standard soft wood yardstick, with slots that measure 316 in. wide and 1 38 in. deep. One point includes permanently fixed pivot pin, the other a replaceable pencil lead in a four jaw chuck. To use as a circle cutter, replace lead with 24 F blade , sold separately.