This is Sammi Tian, from Shandong Liaocheng ZGL Metal Manufacturing Co.,Ltd, which specializes in heavy wall thickness Pipes.Our Commodity Name: Carbon Seamless Steel Pipe.Material ASTM A106B/A53/API 5L B, SAE 1045, DIN1629/2448, ST44, ST52Size OD : 21-508mm ;WT: 4-100mm If you are intersted with our prodcuts, pls feel free to contact me .You are welcome to come and visit our factory anytime.