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) Sizes: 500 x 500 x 28mm, 600 x 600 x 35mm 4) Weight: approximate 11kg (500mm), 13kg (600mm) Features: 1) Surface is treated with static painting with good corrosion resistance 2) High precision for dimensions, good interchangeability 3) All steel structure with high strength and strong anti-impact capability 4) Fireproof, waterproof and dustproof 5) Four corners fixed to prevent from sliding 6) Convenient for both assembling and disassembling