... :J55,K55,N80,L80,P110, Thread:STC,LTC,BTC Standard:API 5ct Size:4-1/2--20" Wall Thickness:5.21 ... pipes.Material:J55,K55,N80,L80,P110Thread:STC,LTC,BTCStandard:API 5ct ISO9001Size:4 1/2”-20”Wall Thickness:5.21 ... -16.13mmCertificate:API 5CT,ISO9001Length:R1 R2 R3 Grade: J55.K55.N80.L80 ... our company! Expecting to cooperate with your company sincerely ! casing pipe