Precision meets reliability with this SPI Gage Block Set, featuring 8 pieces of rectangular steel blocks ranging from 5 to 20 inches. Designed for dimensional calibration and measurement applications, this NIST-traceable set provides the accuracy professionals demand for quality control and inspection tasks. Each block is crafted from high-quality steel for durability and dimensional stability over time. The rectangular shape allows for easy stacking and wringing when creating custom measurement combinations. Perfect for toolrooms, quality labs, and manufacturing facilities where precise measurements are critical. This comprehensive set includes the essential sizes needed for a wide range of calibration applications, all housed in a protective case to maintain their pristine condition. When absolute measurement accuracy matters in your industrial or manufacturing environment, trust this SPI gage block set to deliver consistent, reliable results.