... )Best quality and low price 3)Longer drilling intervals 4) API &IADCBrawny Tricone Bits1)Bits size range :3-3/5"-26"2)Best quality ... ",9 7/8",12 1/4",14 3/4",17 1/2", etc. IADC Code:4-- Series, 5-- Series, 6-- Series,etc. Air Cooling Roller ... minimum.Main Type AvailableSize: 2 3/8",3",3 5/8:",3 7/8",4",4 1/2",4 5/8",4 3/4",6",6 1/2",7 1/2",8 ... 1/2",9 1/2",9 5/8",9 7/8",12 1/4 ...