1,tci tricone bit.tci rock bit 2,certified by API 3,best price 4,wide size code 5,delivery on time Size and types availableSize: Common sizes, 6.6-1/2, 7-7/8, 9-7/8, 10-5/8, 12-1/4Various sizes also can be manufactured by the clients order.Types: IADC Code, 127, 137,216,337,437,517,537,547,617,637,737 etc.1,tci tricone bit.tci rock bit2,certified by API3,best price4,wide size code5,delivery on ...