This Starrett 124AZ Mechanical Solid-Rod Inside Micrometer is an essential tool for anyone who needs to measure the dimensions of objects. This solid rod inside micrometer set has a range of 2 in to 8 in and a resolution of 0.001 inches. The plain thimble allows you to make precise measurements easily, without having to stop and re-zero the device. It has hardened steel components for increased durability and accuracy, as well as anvil and spindle materials that are also made from hardened steel. With this Starrett Mechanical Solid Rod Inside Micrometer Set, you will be able to take accurate measurements quickly and efficiently.