1.Tigersteel :professional manufacturer. 2.Certificate:API&ISO. 3.OD:21.3~508mm WT:2~70mm 4.Standard:ASTM,DIN,JIS,API,GB Specifications Material:J55,K55,N80,L80,P110, Thread:STC,LTC,BTC Standard:API 5ct ISO9001 Size:4-1/2--13-5/8" Wall Thickness:5.21-13.06mm API 5CT Oil Casing Pipe Outer DiameterWall ThicknessNominal Linear MassGradeThreadLengthinmmmmkg/mlb/ft4 1/2"114.35.21-8.5614.14-22.479.50- ...