... scaffolding system, frameISO9001, CE certificatescaffolding pipe, including ERW and Seamless, round and rectangular or square, aew according to standards ASTM ... buyer's request is available. SIZE: 16mm-603mm, Wall thickness:0.8mm---20mm. PURPOSE: fence tube, structural tube, scaffolding tube, ... system tube (with groove available), EMT conduit, furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE