Material:J55,K55,N80,L80,P110, Thread:STC,LTC,BTC Standard:API 5ct Size:4-1/2--20" Wall Thickness ... produces all kinds of casing 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, ... ! Expecting to cooperate with your company sincerely ! casing pipe