Z channel, z purlin Thickness: 2.0mm--3.0mm Z channel, z purlin Z shaped purlin: Used on various steel structure buildings. 1) Height: 100mm, 120mm, 140mm, 150mm, 160mm, 180mm, 200mm, 250mm, 280mm, 300mm, or as per customer's request between 100mm and 300mm; 2) Thickness: 2.0mm--3.0mm; 3) Length: As per customer's requirement. Z purlin