... 13 5/8Φ14 3/4Φ15 1/2Φ16Φ17 1/2Φ18Φ26mm245mm295mm311mm346mm374mm394mm406mm445mm457mm660mm(2)The characteristics of the product IADC CODE437 ... 7 daysapplicationPetroleum and gas, water well, mining and tectonic industries, oil field, construction, geothermal, directional boring and underground foundation work, water ... with customized angles, diamond thickness, chamfers, and sizes. 9 1/2 PDC oil drill bit