... .Steel grade: E75,X95,G105,S135 3.Certificates : API 5DP,NS-1 4. Length: R1: 5.3-7.9m R2: 8 ... be carried out as per customer demand. In line with NS-1requirement. Proprietary product——Tool Joint 1.DPDS——Double Shoulder Tool ... ® AS Inspection System Internal plastics coating DP-Master's Qualification NS-1API5D,API7,API7-1Hardbanding