The Brown & Sharpe 281 Internal Bore Tri Micrometer is a high-quality precision tool designed for measuring the internal bore sizes of precision parts. Made in Switzerland, this micrometer has a range of 4.0" to 5.0" with a minimum measurement of 4 inches and a maximum measurement of 5 inches. With its mechanical reading mechanism, this bore micrometer is perfect for metalworking inspection and measurement tasks, especially in CNC, metalworking, and manufacturing industries. The reputable Brown & Sharpe brand ensures accuracy and reliability in measurements, making it a valuable tool for professionals in a variety of industrial settings.