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Low Relaxation Prestressed Tendon Prestressed Grade 270 Prestressed Steel Wire 0.6' Post Tension System. 28 Years Supply Experience: Uninterrupted supply of post-tensioning products for nearly three decades. DCL Certification: First supplier in China to obtain DCL certification for Dubai market entry. Comprehensive Warranty: 10-year warranty coverage for all mechanical defects. Flexible Customization: Full customization available from samples, designs, or minor adjustments. International Standards: Meets ASTM A416 and BS-5896 standards for high-strength low relaxation. Fast Lead Time: Peak and off-peak season lead times both within 15 workdays.