The Vermont Gage .490 + Class ZZ Pin Gage with Black Guard is a precision tool used for measuring the size of pins with a diameter of .490 inches. Made by the reputable brand Vermont Gage, this pin gage is designed for use in metalworking inspection and measurement applications, particularly in CNC machining and manufacturing. The black guard on this gage helps to prevent glare and interference when taking measurements, ensuring accurate results for quality control purposes.