... 3.Stock adequate 4.Fast feedback Type:Drill Bit 9 7/8" Kingdream TCI Tricone rock drill bit HAS ... HAS 447GType:Center Drill BitMaterial:Carbon steelIADC Code:447size: 9 7/8" (250.8mm)Pin shank size:6 5/ ... and types availableCommon sizes: 6, 6 1/2, 7 7/8, 9 7/8, 10 5/8, 12 1/4Various sizes ... for precise delivery time) E. Bearing( Metal / Rubber) 9 7/8" Kingdream HAS 447G TCI Tricone drill bit with best ...