Molded out of rugged polypropylene plastic, these comfortably handled ammo cans will hold up to some pretty harsh treatment. Utilizing MTM's tongue and groove O-Ring seal system for a superior water-resistant seal, these cans are designed to fit the included ammo boxes perfectly. A heavy-duty dual latching system makes for a better seal and less likely to open accidentally. Double padlock tabs along with molded-in stacking ridges, make these solid containers the perfect solution to so many storage needs. This includes four (4) flip top 100 round ammo boxes that fit the following cartridges: 17 Remington, 204 Ruger, 223 Remington.