Specifications: 1) Color: gray (optional) 2) Tolerance: a) Width and Length: -0.4mm - 0.0mm b) Panel thickness: +0.30mm c) Level: <0.6mm 3) Size: 500 x 500 x 28mm 4) Weight: approximate 11kg Features: 1) Convenient for wiring installation 2) Surface is treated with static painting with good corrosion resistance 3) High precision for dimensions, good interchangeability 4) All steel structure with high strength and strong anti-impact capability 5) Fireproof, waterproof and dustproof 6) Four corners fixed to prevent from sliding 7) Convenient for both assembling and disassembling