Precision meets durability with the SPI 9/64" diameter chrome steel gage ball. Engineered to exacting standards, this calibration tool features an impressive 0.0001 inch tolerance and Grade 25 accuracy, making it ideal for the most demanding measurement applications. The 63 RC hardness rating ensures exceptional wear resistance and dimensional stability over time. AFBMA certification guarantees this gage ball meets industry standards for quality and performance. Perfect for calibration, layout work, and machine setup tasks, this chrome steel ball delivers consistent results in dimensional measurement applications. The precise spherical form and smooth surface finish make it an essential tool for professionals who require absolute accuracy in their measurements. Add this high-quality gage ball to your precision measurement toolkit for reliable performance in critical applications.