Machinist Steel Square is great for centering stones and a wide variety of other uses. Steel square can be used for a machinist, engineer, designer, or a model maker who needs the right size tool for small scale jobs. This product is a high quality tool that is very well made and precise and makes it easier as a set up tool for table saw blades, jointer fences, or to draw and mark lines. This tool will help you make a perfect 90 degree right angle and is ideal for sharp corners on design projects.