... two kinds of specifications models: Square tube: caliber F10 * 10 ---- 100 * 100 --- 300 * 300 --- 600 * 600mm, wall thickness 0.5mm ... ×10~28.0 200×200×6.0~12.0 80×100×2.0~8.0 800×400×10~28.0 ... : Widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses, automobile industry, railways, highway guardrail, container skeleton, furniture, ...