We are appreciated introduce ourselves as the professional manufactuer of Stainless Steel Heat Exchange tube . Size:OD:12.7MM TO 101.6MMWT:0.89MMMM TO 5MM Grade:TP304/304L/321/316/2205/31803/904L and so on . Standard:ASTM A213/A269/A249/A789/A790When you have any required for it , Please do not hesitate to contact with me . Zhejiang guanyu Steel Tube Co.,Ltd www.zjguanyu.com Steven guo Skype :cliff1275347 QQ:645630306 Wechat:13736313585 Whatsapp:0086-13736313585 Email:haisea_0902@aliyun.com haisea_0902@outlook.com Mob:0086-13736313585