The Auto Primer Feed Tube is a reloading tool designed to drop primers one at a time into the primer plug and sleeve. It aids in stopping ammunition misfires by eliminating the contact of greasy fingers with the primers, and the nylon primer pick-up feature keeps primers from falling out. Tube capacity for this item is 100 primers and is compatible with the RCBS Rock Chucker II Press, JR Press and Reloader Special Press. NOTE: Not for use with the RCBS RC Supreme