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Perfect for use by students or professionals, this set features a high-quality compass, ruling pen and extension bar. The compass has a smooth-action, rapid adjustment feature with a sturdy push-button mechanism and center wheel for fine adjustments; a double knee-joint allows for parallel leg positioning and use with an extension beam, universal adapter or ruling pen - all of which are included. The ruling pen can also be used separately to create precise lines and drawings with ink, masking fluids or even thin paints. Packaged in a reusable plastic case, this set is easy to keep organized and transport.