We are a reputed name in this industry as a exporter of drilling casing in beijing, china. Description & specification:- Size: 4-1/2-13-3/8 Grade: j55, k55, n80, l80, c90, t95, p110, v150 Thread type: stc, ltc, btc Length: r1, r2, r3 Standard: api spec 5ct/iso 11960
