The Acme Single Surface Optical Flat Set of 4 is a precision tool used for metalworking inspection and measurement in CNC manufacturing. These optical flats are essential for achieving accurate results in measuring surfaces and detecting imperfections. The set of 4 flats ensures a comprehensive analysis of different areas, providing valuable insights for quality control in industrial manufacturing processes. With the trusted brand of Acme, this set is a reliable choice for professionals in the metalworking industry looking for precise and reliable measurement tools.