Precision meets durability with the SPI 17/32" Diameter Chrome Steel Gage Ball. Engineered for dimensional measurement applications, this high-quality gage ball features exceptional accuracy with a Grade 25 rating and tight 0.0001 inch tolerance. The chrome steel construction provides a hardness rating of 63 RC, ensuring consistent performance and resistance to wear during calibration, layout, and machine setup tasks. This AFBMA-certified gage ball maintains dimensional stability even under demanding measurement conditions. Perfect for quality control departments, machine shops, and precision manufacturing environments where exact measurements are critical. The ball's precise spherical form makes it ideal for calibrating measuring instruments, checking radius gauges, and serving as a reference standard for dimensional verification processes.