Achieve precision measurements with this SPI 15/16" diameter chrome steel gage ball. Engineered to exacting standards, this high-quality measurement tool features an impressive 0.0001 inch tolerance and Grade 25 accuracy, making it ideal for calibration and dimensional verification tasks. The 63 RC hardness rating ensures exceptional durability and resistance to wear during repeated use. This gage ball comes with AFBMA certification, confirming its adherence to industry standards for dimensional measurement applications. Perfect for quality control departments, machine shops, and precision engineering facilities, this chrome steel ball provides the reliability needed for critical measurement operations. The consistent spherical form and smooth surface finish make it an essential tool for professionals who demand accuracy in their measurement processes. Part #12-746-4 is manufactured by MSC Industrial under the trusted SPI brand.