This product listing is specifically for a caliber-specific funnel head and it does not include the funnel or the billet storage block. The Area 419 billet aluminum powder funnel is renowned for its system of interchangeable, caliber-specific heads, making it the top choice for reloaders today. This innovative system effectively resolves several common issues associated with universal plastic powder funnels, offering a more tailored and efficient solution for reloading enthusiasts. The external flutes are primarily for aesthetic purposes, however, internally, they function to disrupt the powder kernels, preventing them from clogging at the neck It also provides additional airspace to prevent excessive compaction, thereby enhancing the flow through the nozzle