Patented Fully Foamed Lid creates a rigid wall between outer aluminum layers to help prevent bending or warping. Stainless Steel Lock Handles provide strength, security and rust-free product life. Connecting Rod Enclosure helps prevent box contents from bending or jamming the locking system. 0.063 in. Aluminum One-Piece Tub and Lid is designed to support heavy loads, absorb tool drops and prevent leakage. Self-Closing Struts Self-Closing Struts automatically close the lid, with slight manual pull, securing the box when hands are full. MicroSeal Stripping helps seal out moisture, dust and dirt. 2 Built-in Tool Trays and Screwdriver Holders add extra strength and rigidity to the box?also makes tools immediately accessible. Lid Opens 90° for easy loading and unloading of tools and equipment. 3-Compartment Sliding Tray or convenient small item storage and retrieval.