Achieve precision measurements with the SPI Rectangle Steel Gage Block (0.127"), Grade AS-1. This high-quality dimensional measurement tool comes complete with NIST Certification, ensuring accuracy and reliability for your most demanding calibration needs. Manufactured by MSC Industrial under the trusted SPI brand, this rectangular steel gage block (Part #15-041-7) is designed for professional use in quality control, machining setups, and inspection processes. The durable steel construction provides consistent measurements and long-lasting performance. Perfect for calibrating measuring instruments, setting up machinery, or as a reference standard in manufacturing environments. This precision tool helps maintain quality standards across your production processes with its certified dimensional accuracy.