The Thermal Dynamics 7-7501 Circle/Radius Cutting Guide Kit is an easy-to-use guide that cuts circles from 3" up to 28.5". It maintains a consistent height off the work piece whether you are using the circle cutting attachment for cutting circles or the roller guide feature to improve your straight-line cutting. Both novices and experts will see noticeable improvement in quality, speed and parts life. Can be used with most Thermal Dynamics torches and fits all SureLok and 1Torch plasma torches.