The Hornady Lock-N-Load Pistol Metering Insert is specifically engineered for use with the Hornady Lock-N-Load Pistol Rotor to deliver enhanced powder measuring precision for pistol cartridge reloading.Hornady Lock-N-Load Pistol Metering InsertDesigned specifically for pistol powder measuring applicationsCompatible with Hornady Lock-N-Load Pistol Rotor systemQuick-change design - switches in and out with the touch of a buttonImproves rotor performance efficiency and precisionWorks with Hornady Lock-N-Load Powder MeasureEssential for reloaders seeking consistent accurate powder charges in pistol cartridges this insert enhances your reloading setup's performance and workflow efficiency.