The Stanley Fatmax Structural Foam Toolbox is made of structural foam which consists of thermoplastic resin and mica flakes Durable and ergonomic top and side handles for easy carrying of heavy loads Equipped with patented water seal feature that makes it suitable for power tools Comes with portable half-tray which is ideal for larger tools It consists of V-groove to hold materials steadily while sawing/cutting Carry power tools, hand tools, gear, and other medium-to-large items easily Structural foam consists of thermoplastic resin and flake mica that increases structural durability Extra heavy duty, professional toolbox Portable half tray allows room for storage of larger items V-groove with ruler on top of lid holds materials such as lumber and pipes in place for cutting