Precision meets durability with the SPI 3/4" 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 the most demanding calibration and inspection tasks. The chrome steel construction provides exceptional hardness at 63 RC, ensuring consistent performance and long-lasting reliability. AFBMA certified, this gage ball delivers the confidence professionals need for precise dimensional measurements. Perfect for quality control departments, machine shops, and metrology labs, this gage ball serves as an essential reference standard for calibrating measuring instruments and checking part dimensions. The polished chrome finish resists wear while maintaining dimensional stability across repeated uses, making it a valuable addition to any precision measurement toolkit.