The original and world's most popular hand-held priming tool. Fast and economical hand held priming with unmatched feel and accuracy. Lee New Auto Prime uses inexpensive Lee Hand Prime shell holders only. Ships with 1 folding primer tray, 1 small and 1 large adapter. Includes a FREE molded storage box to keep your priming tool shell holders and tool together. Molded storage box holds up to 18 shell holders. Please note: Lee Precision has tested the tool by intentionally setting off a variety of brands and types of primers. Our testing has demonstrated that wearing safety glasses and hearing protection will prevent serious injury. However, all types of FEDERAL BRAND LARGE PRIMERS frequently caused the entire tray to explode with sufficient force to cause serious and painful injuries. These primers must be fed individually, see step 7 of product instructions, single priming option.Specifications and Features: Automatically feeds and installs Built in primer flipper One folding primer tray, one small adapter, and one large adapter.