... 3. delivery time:3-10days High frequency welded light gauge H Sections for contruction 1.standardGB/T 1591, GB ... . Steel gradeST37, A36, SS400, ST52, SM490, SM5703. Length6METER, 9 METERS, 12METERS or customized.4. packingBlack painting and in bundles5 ... 18129l 250*125*6*929.7496*199*9*1479.5l 250*250*9*1472.4500*200*10*1689.6l ... 300*10*1594.5600*200*11*17106l 340*250*9*1479.7700*300*13*24185l 346*174*6* ...