Accepts a variety of optional removable tool drawers, horizontal and vertical tool pallets and a top tray. The case has narrow slides to hold the optional drawers. The case is constructed from Ultra-high impact structural copolymer that is crushproof, and dust proof. It has 2 built-in automatic pressure equalization valves; one for the top lid and a second for the main compartment. There are hybrid double throw latches with a mesh butterfly compression latch and stainless steel hinge pins that provide extra protection from impact.