Precision meets durability with SPI's 1/4" diameter Chrome Steel Gage Ball. Engineered for dimensional measurement applications, this high-quality gage ball features an impressive 0.0001 inch tolerance and Grade 25 accuracy, making it ideal for the most demanding calibration and inspection tasks. With a robust 63 RC hardness rating, this chrome steel ball maintains its dimensional stability even under regular use. AFBMA certification ensures this measurement tool meets industry standards for quality and consistency. Perfect for machine setup, calibration procedures, and precision layout work, this gage ball delivers reliable performance for professional measurement applications. The chrome steel construction provides excellent wear resistance and dimensional stability, making it a dependable addition to any quality control toolkit or metrology lab.