Are those bullet diameters completely consistent? You'll want to make sure before counting on cast rounds or any factory projectiles for complete precision and accuracy. Hornady's Micrometer is capable of providing the incredibly accurate measurements demanded by modern reloaders. The Hornady Micrometer can measure object diameters of up to an inch with an accuracy of 0.0001-inch increments. Each micrometer is equipped with a ratchet-stop mechanism that allows users to place uniform, consistent pressure on the object being measured, ensuring that measurements are repeatable and consistent. After measuring, a spindle lock allows users to remove the micrometer to take a look at the preserved measurement. Each Hornady Micrometer is finished with a baked-enamel coating and features a strong, durable, C-frame design. The micrometer ships with a protective, plastic hard case.