Achieve precision measurements with the SPI Rectangle Steel Gage Block. This 0.45" block is manufactured to Grade AS-1 specifications, ensuring exceptional accuracy for your dimensional measurement needs. Each block comes with NIST Certification, validating its calibration and reliability for professional applications. The rectangular steel construction provides durability and stability during use, making it ideal for quality control, inspection processes, and machine setup tasks. Part #15-075-5 is designed to meet industry standards for dimensional reference, offering consistent performance in manufacturing and engineering environments. This gage block serves as an essential tool for calibration professionals who require dependable measurement standards. Add this high-quality dimensional reference tool to your calibration arsenal for consistent, accurate results.