Achieve precision in your dimensional measurements with the SPI Rectangle Steel Gage Block. This 12-inch Grade AS-1 gage block is an essential calibration tool for professionals who demand accuracy in their measurements. Manufactured by MSC Industrial under the trusted SPI brand, this high-quality steel gage block comes with NIST Certification, ensuring its reliability for critical measurement applications. The rectangular design provides stability and consistency when used for machine setup, calibration, or inspection tasks. Part #15-095-3 is crafted to meet rigorous industry standards, making it suitable for quality control departments, machine shops, and manufacturing facilities where dimensional accuracy is paramount. This gage block serves as a reference standard for verifying measuring instruments and setting up precision equipment. Its durable steel construction ensures longevity even with regular use in professional settings.