Water and Dust Proof: IP66 certified. High protection for valuable tools. Heavy-Duty: Extremely durable ribbed construction. Lid withstands pressure up to 264 lbs. Create comfortable working platforms. Modular: Mix and Match with variety of QS ONE line. Ultimate solution for your mobile workshop. Robust lever-type latches and HD side connectors, made of technical polyamide, 2 solid PP handles. Eco-friendly: Made of premium recycled materials. Every lid in QS locks in 'open' position (90 deg.) preventing accidental closing. Secure: Padlockable. Containers internal dimensions: 2 pcs. 5.7 x 4.3 x 3.5 in., 4 pcs. 2.4 x 4.3 x 3.5 in. Max load: 110 lbs. internal dimensions: 20.43 x 12 x 3.82 in., diagonal: 26.73 in.