... .:2.75-25mm 3 length:1-20m 4 contact: irene spiral steel pipeProduct nameSpiral Steel PipeOut diameter165-3048, 6 1/2 ... , STK400, STK490, STK500, STK540, STPG370, STPG410 etc.EndPlain end, beveled, cut square, grooved, threaded and coupling, etc.FinishBare, varnished, zinc coating ...