The Starrett Radius Gage Set No. S167A (S-167A) is a high-quality tool used for measuring the radius of various metal surfaces. This set includes a range of radius gages from Starrett, a well-known brand in the industry. The gages are housed in a convenient red case, making them easy to transport and store. Perfect for metalworking and manufacturing applications, this set provides accurate measurements for CNC machining and inspection purposes.