6" Pro Speedbow CompassThis high quality 6" compass is made of rolled brass with a durable nickel-plated satin finish. It features a smooth-action, rapid adjustment feature with a sturdy push-button mechanism and center wheel for fine adjustments. It can be used to draw circles up to 14" in diameter. The double knee-joints allow for parallel leg positioning and use with an extension beam, ruling pen or universal adapter. The compass comes packaged with 2 replacement leads in a reusable plastic case.