The Sunnen Split Anvil Dial Bore Gage GR 3000 is a high-quality precision tool used for measuring bore sizes with an accuracy of .0001 inches. Made by the reputable brand Sunnen, this dial bore gage is designed to provide accurate measurements for metalworking and manufacturing applications. Its split anvil design allows for easy and precise measurements, making it a valuable tool for professionals in the CNC and metalworking industries.