The Hornady Lock-N-Load Powder Measure Rifle Micrometer Metering Assembly is the perfect tool for the reloader looking to improve the function of their Hornady Lock-N-Load Powder Measure. The metering assembly features an micrometer dial adjustment for making very small adjustments, allowing you to dial in a precise powder charge. The etched marks allow you to easily dial in the exact powder charge in-between 10 grains up to 100 grains of powder and are very helpful when returning to your favorite load setting.