Features: High-frequency welded Zinc : 60-120g 200g 300g 400g/m2 Outer diameter : 21.3-219mm Wall thickness : 0.4-13mm Material: Q195,Q215,Q235,Q345, GR.A, GR.B, API J55, API K55, 10#,20#, etc. Length: 3-12m or as the customers' requirement. Standards: ASTM-A53, BS1378-1985, GB/T3091-2001, GB/T3087, Customized Packing details : in bundles or in loose or seaworthy packing at sellers option or as per customers' requirement.