API 5CT PLS1 K55 R2 STC Threaded and Couplings Standard:API 5CT Grade:J55,K55,N80,L80,P110,Q125 Material:seamless casing steel pipe(ERW is also ok) Threaded:BTC,LTC,STC,VAM TOP. Couplings with PIN and BOX Outer diameter:4 1/2"-20" (114.3mm-508mm) Wall thickness:5.21mm-16.13mm Lb/Ft:9.5-40.5 Length:Range1(4.88-7.62m) Range2(7.63-10.35m) Range3.(10.36-14.63m) but in fact the range length is 10.36-11.9m,also in fact this kind is used commonly. Certification:API 5CT,MTC (Material test certification) The Third Inspection:SGS,BV,or according to clients needs. Packing:In bundles by steel strips,with thread protector and nylon ring. Delivery time:within 40 days (in stock) WE HAVE BIG STOCK IN STOCK SUPERIOR QUALITY AND REASONABLE PRICE!!! TIMELY DELIVERY!!!