Machined from 6061 Aluminum, then hardcoat anodized, and finally laser engraved for a truly top notch reloading tray that will maintain its finish for years to come. Innovative open-sided design prevents powder from getting stuck in the tray. If you’re looking for a loading block that’s made with as much precision as your ammunition, look no further. 25 round capacity, with a hole diameter of .810″. 50 BMG trays and tops WILL NOT work with other MK Machining reloading tray components.