Achieve machine-level accuracy with this 81-piece rectangular steel gauge block set designed for precise equipment calibration. Each set includes a unique certificate of inspection to ensure reliability and traceable dimensions for machinists and mechanics.

• Comprehensive 81-piece workshop-grade set featuring steel blocks ranging from 0.05 in. to 4 in.
• Includes a unique certificate of inspection following ASME B89.1.9 standards for traceable accuracy.
• High-precision calibration with a tolerance of +0.25 to -0.15 microns.
• Hard-shelled carrying case provides organized storage and protection from contaminants.
• Versatile toolset ideal for machinists, mechanics, and woodworkers needing reliable measurement calibration.