our company are steel tube suppliers,can offers inexpensive and high-quality steel tube and fittings our company are steel tube suppliersSpecification of steel tube:outer diameter:14mm-325mm Wall thickness: 1.5mm-45mm Standard:GB/T17396-1998 Material:ASTM A106 ,ASTMA53,ST37.ST52 Application: Hydraulic support, hydraulic prop Packing: Caps on two ends, wrapped with strong steel strip, or according ...