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Description:Specifications: 1) Outer diameter: 21.3 - 165.0mm 2) Tolerance: +0.5% ~ +1% 3) Normal thickness: 2.75 - 4.50mm a) Tolerance: +12%, -15% b) Weight (kg/m): 1.26 - 17.81 4) Heavy Thickness: 3.25 - 5.50mm a) Tolerance: +12%, -15% b) Weight (kg/m): 1.45 - 21.63