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🔹 Key Specifications Parameter Details Section Size 40mm × 20mm (Width × Height) Wall Thickness 0.5mm – 3.0mm (Common: 0.8, 1.0, 1.2, 1.5, 2.0mm) Length 6 meters (tiêu chuẩn), or custom lengths (e.g. 5.8m, 12m) Tolerance ±0.1mm – ±0.3mm (per ASTM A554 / JIS G3463) Corner Radius Typically 1.5–2.5× wall thickness Surface Finish 2B, BA (2BA), No.4 (Xước), 8K (Gương), or Custom…