The drill rods comply with the provisions of API SPEC 5D & API SPEC7. Specifications1.Drill Pipe 2.size from 48- ... 1/4"-48"( 13.7mm - 1219.2mm )Main Standard: API 5L, ASTM A 106, ASTM A53, GB/T 8163, ... ,B,C,A53GrA,B,C,API 5L X70, X65, X60, X42,X46,X52,X56,GR.B, Q345, Q235, Q195, 20#, ... 10#, S235JRH, S275JOH, S355JOH,P325TR1,ST37,ST52,ST37.4,ST45 etcCertificate: API 5L & 5CT ...