... 3.all sizes od diamond bit PDC drill bit 1) Sealed rolling bearing, cylindrical roller cone body placed in the groove ... length(mm)API Connection(in)7-7/85504-1/28-1/25604-1/212-1/47906-5/8Cangzhou Great Drill Co., Ltd. ... TCI Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8, ... Tooth Tricone Bit3 7/8 ,5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8, ... blades,5 blades,6 blades)5 1/2, 6 1/27 7/8,8 1/2,8 3/410 5/8 ...