1.best quality for 6"~17 1/2" 2.high quality,best price ... ,7,8,9,... Specifications1.best quality for 6"~17 1/2" 2.high quality,best price 4. ... :Diamonds are impregnated in the matrix behind the PDC cuttersBenefit:Increased footage drilled in abrasive applications 2.details ... ,152,215.9,244,311,445Typeall kinds and size PDC bitsApplicablewater well, oil field, construction, geothermal, directional boring ...