... , M65, L80, C90 3.Casing Length: R1,R2, R3 API 5CT Casing 1.Casing Sizes: OD 4-1/2"~20" 2.Casing Grade: H40, J55, K55 ... , N80, M65, L80, C90 3.Casing Length: R1 ... /8"to 4-1/2"(EUE/NU) Casing: From 4-1/2" to 20", Casing Threads: BTC, LTC, STC. Casing Length range: R1, R2, R3Casing ...