MTM PRIMER FLIPPER SQUARE Easily fill primer pick-up tubes with MTM's new Primer Flipper Square. Our new square design makes adding primers from traditional factory packaging a piece of cake. Offering two options for lid closure: snap closed for spill-proof storage, or rotate the lid 90 degrees for a smooth, friction-free, lift-off removal. Features a marking area on the lid to denote what primers are in the tray, along with a clear-view design for easy identification.