... .WT:5.21-12.19mm 3.standard:API J55, API K55, API N80, API L80, API ... Oil casing pipe)Specification: 114.30-339.73*5.21 ... :API SPEC 5CTMaterial:J55,K55,L80-1,C-75, N-80, C-90, T-95, Q-125, P110Connection:Casing: LTC, STC, BTC ... .Tubing: NUE, EUEEnd:Beveled, Square cut. And pipe protection cap specially for casing and tubingSurface ...