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The flange coupling is made from 45 # metallic (a kind of iron), hardened by warmth treatment, and then plated. Attention : This product would not consist of a wrench and desires to be purchased separately. Thank you very much! Product Description: Name : Flange couplingMaterial :45 # steelSurface medication : ElectroplateSize: 3mm , 3.17mm , 4mm , 5mm , 6mm , 6.35mm , 7mm , 8mm , 10mm , 11mm , 12mm . Package Include: According on your Choose!