The Case-Gard R-50 ammo box is made of indestructible polypropylene that will not warp, crack, chip, peel, expand or contract. It features a full length mechanical hinge and textured finish which makes it easier to grip and harder to scratch. This Case-Gard R-50 ammo box is supplied with a load label for recording load and sight data. Made in USA. This ammo box is compatible with the following calibers: 17 Fireball, 17 MACH 4, 17/221/222/223 Rem., 204 Ruger, 218 Bee, 222 Rem. Mag., 223 Rem. HP, 25-20 Win., 300 Blackout, 300 Sherwood, 300 Wisper, 32 Ideal, 32/401 Win. S.L., 351 WSL, 38-55 Win., 5.56x45, 6x47, 6mm TCU, 6mm-223 Rem. and 7.62x37 Musang.