... .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 ... - 12.19Standard:API SPEC 5CTMaterial:J55,K55,L80-1 ... LTC, STC, BTC.Tubing: NUE, EUEEnd:Beveled, Square cut. And pipe protection cap specially for casing and tubingSurface:Corrosion proofing water ...