Item :API 5CT seamless oil casing Steel Grade: J55 K55 N80 L80 P110 Size: from 3 1/2'' to 20'' Cert: API 5CT ISO Length: R1/R2/R3 Thread type: BTC STC LTC NU EU Delivery time : within 30 days Surface treatment: painted Waranties : one year from the products finished. Packing:standard export bundle wrapped with strong steel strip strict material grade classified and quality inspection sea worth packing accroding to the API specifications.