... medium to medium-hard formations.2,Evolute asymmetrical blade cutter design and balanced bit load so that bit whirl ... .Feature:Diamonds are impregnated in the matrix behind the PDC cuttersBenefit:Increased footage drilled in abrasive applications 2.details: ... Model118,152,215.9,244,311,445Typeall kinds and size PDC bitsApplicablewater well, oil field, construction, geothermal, directional boring, ...