... dip galvanized 4.Custom size available 5.High strength Galvanized z purlin design Specification Item NoSS009MaterialQ235,Q345,G550FinishHot dip galvanised Thickness1 ... prepunched holeHole Size:φ8,φ10,φ12,φ14,φ16,φ18 10*20,12*20,16*20,14*22,18*18,18*22Coating Mass350g ... based on detail design 4.Complete accessories package available Application Z sections may be used in single spans, unlapped continuous ...