Its large dispensing tube prevents clogging due to moisture or residue. This assures the priming powder flowing freely into the pan. Will throw or dispense about a 2 grain charge by simply pushing the spring loaded tube of the primer down on the center of the pan of a flintlock and raising primer. Holds about 40 grains of priming powder. Ends are knurled for easy removal to fill. Only 3" long. This primer can also be used as a nipple charger for percussion rifles.