... :3-3/5"-26" 2)Best quality and low price 3)Longer drilling intervals 4) API &IADC 1)Bits size range :3-3 ... /5"-26"2)Best quality and low price 3)Longer drilling ... Available Size: 6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",17 1/2", etc. IADC Code:4 ... /4",6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/8",12 1/4",15",15 1/2",17 1/2", etc. IADC ...