Precision meets reliability with the SPI Rectangle Steel Gage Block measuring exactly 0.103 inches. This Grade AS-1 gage block delivers the exacting standards required for dimensional calibration in manufacturing and quality control environments. Each block comes with NIST Certification, ensuring traceability and compliance with national measurement standards. Manufactured by MSC Industrial under the trusted SPI brand, this rectangular steel block provides the dimensional reference needed for accurate instrument calibration and part inspection. The durable steel construction offers excellent wear resistance and dimensional stability over time. Perfect for metrology labs, machine shops, and inspection departments where precise measurements are critical to operations. Part #15-017-7 represents SPI's commitment to providing industry-standard measurement tools for professionals who demand nothing less than absolute accuracy.