1.OD:3 1/2'' 2.Thread:NC38 3.Grade:R780/E75 4.Wall thickness:9.5mm 5.Upset:EU 6.Length:21 feet Certification: 1. ISO 9001: 2008 2. API 5DP-0011 3. GOST No.: 1739641 *Longway is professional production of drilling tools, if you want to know more about our products, pls feel free to contact us. *Caroline is at your service in 24 hours Skype:carolinechina2 QQ:2595308276 Mobile: +86-13673119276 ------------------------------------------------------------------------ Longway's best quality drill pipe of API standard