The 3i-3424-12 Utility Case measures an impressive interior dimension of 34. 5x24. 5x12. 75 is molded of ultra high-strength polypropylene copolymer resin and features a gasketed, water and dust tight, submersible design (IP67) that is resistant to corrosion and impact damage, and an automatic ambient pressure equalization valve (MIL-STD-648C) to assist with moisture control.This iSeries size is another new size that is being produced on SKBs Energy Saving Hydraulic Toggle Injection Molding System at SKBs manufacturing facility in Orange, California. This injection system is one of the largest and most efficient injection molding systems in the United States.