Precision meets reliability with the SPI Rectangle Steel Gage Block. This 0.15" Grade AS-1 gage block is an essential tool for dimensional measurement and calibration applications. Manufactured to exacting standards by SPI, this rectangular steel block provides consistent, accurate measurements for quality control and inspection processes. Each block comes with NIST Certification, ensuring traceability and compliance with industry standards. The durable steel construction offers excellent wear resistance and dimensional stability over time, making it ideal for frequent use in manufacturing environments. Perfect for calibrating measuring instruments, setting up machines, or as a reference standard in metrology labs. This high-quality gage block (Part #15-064-9) delivers the accuracy and dependability professionals demand for critical measurement applications.