The 50 Caliber metal military ammo cans were originally designed to be used for 50 BMG 100 round linked belts. They came marked some time as M2 or 5.56mm or have various other ammunition & military markings. Double latch design prevents accidental openings. Double padlock tabs. Designed to hold up to 25 pounds of ammo or gear Made in USA Inside Dim: 5.8"(L) x 11.0"(W) x 7.2""H) Outside Dim: 7.4"(L) x 13.5"(W) x 8.5"(H)