This precision cylindrical master square is a must-have for metalworking inspection and measurement. The base length of this cylindrical square is 6 inches and it is made of high-quality steel. This item is perfect for those in the CNC, metalworking and manufacturing industry. It is an essential tool for ensuring accuracy and precision in your work. Don't miss out on this opportunity to enhance your business and industrial capabilities. Order now and experience the benefits of this top-grade cylindrical square.