... 3)Longer drilling intervals 4) API &IADC 1)Bits size range :3-3/5"-26"2)Best quality and low ... Longer drilling intervals 4) API &IADCBrawny Tricone Bits1)Bits size range :3-3/5"-26"2)Best quality and low ... Available Size: 6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 ... 7 1/2",7 7/8",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",14 3 ... minimum.Main Type AvailableSize: 8 1/2",9 1/2",9 5/8",9 7/8",10 5/8",12 1/4", etc ...