SPI Black Pin Gage Set These pin gages include a black oxide treatment that helps prevent corrosion and also shows gage wear, saving money and time. Features include... 0.501" - 0.625" Range 125 Pins PLUS Set (+.0002" / -0") For quick and accurate measurements. Measure hole sizes, slot widths, calculate distances between holes, use as GO / NO GO gaging, etc. Each set includes pin gage holder. Furnished in attractive molded plastic case. Class ZZ guaranteed to 0.0002" / 0.005mm tolerance limit. Inspected with equipment which has been calibrated and is . 10 micro finish or better. Certificate of Accuracy included