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. Fits Calibers OAL 2.46" 219 Zipper, 223/243/25/270 WSSM, 401 Win. S.L., 458 SOCOM, 460/500 S&W Mag., 475/500 Linebaugh, 50 Beowulf. Also holds 50 AA batteries and they won't come out of there compartments when turned on it side.