... 1. Manufacturer of TCI & steel teeth tricone bits 2. ISO & API 3. Quality products & good service 4. Good feedback of clients 17 1 ... Main Type Available Size: 6",6 1/2",7 1/2",8 1/2",9 1/2",9 5/8",9 7/ ... cone-dropping to minimum.Main Type AvailableSize: 8 1/2",9 1/2",9 5/8",9 7/8",10 ... /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",15",15 1/2",17 1/2", etc. IADC Code:5-- Series ...