The SKB iSeries 3021-18 Waterproof Utility Case is a water and dustproof, polypropylene, copolymer resin case. It is resistant to UV, solvents, corrosion, fungus, and impact damage to keep your delicate items safe and dry. It features an automatic ambient pressure equalization valve as well as a secure molded-in hinge design. A trigger release latch system maintains a tight seal and offers easy access. Transporting the case is possible with three snap-down, overmolded grip handles and one tow handle to use when rolling the case on the four in-line skate-style wheels. The padlock holes come with stainless steel protector clips .