... 25mm 3 length:1-20m 4 contact: irene spiral steel pipeProduct nameSpiral Steel PipeOut diameter165-3048, 6 1/2"-120"Wall ... .Quality gradeFirst class, prime, newly produced, secondary , stock etc.Material/steel gradeA25, A25P, A, B, X42, X46, X52, X56, X60, ... form cast-in-place concrete piles,for welded, riveted,or bolted construction of bridges and buildings, and for general structural purposes ...