SKB 3i-2217-12B-E Mil-Std. Waterproof Case is molded of ultra high-strength polypropylene copolymer resin, featuring a gasketed, water and dust tight, submersible design (MIL-C-4150J) that is resistant to corrosion and impact damage. Features a molded-in hinge for added protection, patent pending "trigger release" latch system, comfortable, snap-down rubber over molded cushion grip handle, automatic ambient pressure equalization valve (MIL-STD-648C).SKB 3I Series Injection Molded Mil-Standard Waterproof Cases features padlock locking loops that include stainless steel protector clips for added strength.