... & good service 4. Good feedback of clients seal tri cone bit : size from 60mm to 26 inch,metal ... 7/8",12 1/4",17 1/2", etc. IADC Code:4-- Series, 5-- Series, 6-- Series,etc. 2 ... 1/4",14 3/4",17 1/2", etc. IADC Code:4-- Series, 5-- Series, 6-- Series,etc. 3 ... 8",10 5/8",12 1/4", etc. IADC Code:5-- Series,6-- Series,7-- 4,Non-Sealed ... 1/2",17 1/2", etc. IADC Code:5-- Series,6-- Series seal tri cone bit