Mec SizeMaster / Steelmaster is a single-stage shotshell reloader that offers precision, convenience and efficiency for both lead and steel shot reloading. It features a resizing station that accommodates both high or low brass heads, and the highly accurate "Power-Ring" collet resizer returns every base to factory specifications. The E-Z Prime auto primer feed dispenses primers automatically, eliminating the time-consuming bother of handling individual primers. It holds a full box of primers and greatly enhances the speed of production.