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Product DescriptionThe MEC Sizemaster is loaded with premium features and offers simplicity without sacrificing convenience and efficiency. The highly accurate "Power Ring" collet resizer returns every base to factory specifications. The all-new resizing station handles brass or steel heads, both high and low base. The E-Z Prime auto primer feed is standard equipment; it dispenses primers automatically. No automatic primer feed on .410 bore. The press is also adjustable for 3" shells. For 20 gauge ammo.