Achieve precision measurements with the SPI Rectangle Steel Gage Block. This Grade 0 block measures exactly 0.05 inches and comes with NIST Certification, ensuring the highest standards of accuracy for your dimensional measurement needs. Manufactured by MSC Industrial under the trusted SPI brand, this calibration tool is essential for quality control processes, machine setup, and precise layout work. The rectangular steel construction provides durability and dimensional stability over time, making it ideal for professional measurement applications in manufacturing and engineering environments. Part of a comprehensive range of calibration tools, this gage block (part #12-640-9) delivers the consistent performance and reliability required for critical measurement tasks where accuracy is paramount. Perfect for metrology labs, toolrooms, and inspection departments where verified measurement standards are essential.