About Product:The carbon steel size head is made of carbon steel and is 2 for The connection between two pipes of marketers diameters. The carbon steel size head as The name The implies The use of carbon steel material, Mainly represented by 20 #, Q235, Q345, 16 mn. 2 for the connection between two pipes of marketers diameters. \"According to the shape of the company, Concentric means that the center of the circle at either end of the tube is on the same line and is called concentric head, The or eccentric head.