The Hornady Lock-N-Load Micrometer Metering Insert dramatically improves the precision of your Hornady Lock-N-Load Powder Measure with micrometer adjustment capability for incredibly fine powder charge tuning.Hornady Lock-N-Load Micrometer Metering InsertPrecision micrometer adjustment dial for fine-tuning powder chargesThrows rifle powder charges from 10 to 100 grains depending on powder typeQuick-swap design - installs and removes with the touch of a buttonCompatible with Hornady Lock-N-Load Powder Measure systemsEssential upgrade for reloaders seeking consistent precise powder charges with easy adjustment capabilities for various rifle cartridges and powder types.