Precision meets durability with this SPI 1" diameter Chrome Steel Gage Ball. Engineered with exceptional 0.0001 inch tolerance and Grade 25 accuracy, this calibration tool delivers consistent, reliable measurements for your most demanding applications. The 63 RC hardness rating ensures outstanding wear resistance and dimensional stability over time, making it ideal for professional measurement settings. AFBMA certification guarantees this gage ball meets industry standards for quality and performance. Perfect for calibration, layout work, and machine setup applications, this chrome steel ball maintains its dimensional integrity even with regular use. The polished chrome finish provides smooth surface characteristics essential for precise measurement tasks. When your work requires absolute measurement confidence, this SPI gage ball delivers the accuracy professionals depend on.