PRECISION GRANITE 100% USA MADE and Certified Master Squares

All granite squares are available in custom sizes and configurations: special thickness, threaded inserts, with or without lightening holes.  *NIST Cert Included* (ISO 17025 complaint cert can be quoted as an option) 

Modern CNC machines require multi-faced reference standards to ensure proper machine alignment. For 35+ years PRECISION GRANITE USA Master Squares have been an accurate, dependable USA MADE and CERTIFIED choice for any machine geometry application or setup.  Master Squares are also especially useful in Quality Labs or Inspection environments providing both Vertical and Horizontal precision surfaces for validating squareness and parallelism of test equipment.

5-FACE Master Squares  *One large face and four edges flat, square and parallel to each other

6-FACE Master Squares  *Two large face and four edges flat, square and parallel to each other