Mae China Vigor Drill Collar wedi paratoi i'w danfon i'n cleient yr wythnos hon, am ragor o fanylion fel isod ；
DRILL COLLAR, OD ： 4-3 / 4'', ID: 2.250'', YSTOD: 31FT, GRADD COLLAR DRILL (SMYS): 120KSI, DEUNYDD COLLAR DRILL: AISI-4145H Wedi'i Addasu (dur aloi cromiwm molybdenwm), MATH: SLICK, ELEVATOR& COFNODION SLIP: 16'' / 18''.
