Type: Oil casing & Oil tubing Size: Casing (4 1/2”-20”*5-22mm), Tubing (1.05”-4 1/2”*3-16mm) Length range: R1,R2,R3 Standard: API 5CT Grade: K55/55, N80/L80/L80 13Cr, P110 End connection type: LTC/STC/BTC,Premiumthreads Surface treatment: varnish coated to prevent rust Marking: As per standard & customer's requirements Application: For the exploration, development and production of oil and gas