... adequate 4.Fast feedback Type:Drill Bit 9 7/8" Kingdream TCI Tricone rock drill bit HAS 447G Place of ... Name: Kingdream,CS,LilinModel Number:HAS 447GType:Center Drill BitMaterial:Carbon steelIADC Code:447size: 9 7/8" (250.8mm)Pin ... also can be manufactured by the clients order.IADC Code:,437,517,537,547,617,637,737 etc. Please ... / Rubber) 9 7/8" Kingdream HAS 447G TCI Tricone drill bit with best price