The GAGE BLOCK 0.123 GR 0 from Field Tool Supply is a precision measuring tool designed for accurate calibration and measurement in various machining applications. Made from high-grade steel, this gage block ensures durability and reliability. With a size of 0.123 inches, it meets industry standards for precision measurement. Ideal for use in quality control and inspection processes, this gage block is compatible with a range of measuring systems. Each block is meticulously finished to provide a smooth surface for accurate readings.