... 4,5,6,7,8,9,... 1,Application:1,Suit for drilling medium to medium-hard formations.2,Evolute asymmetrical blade cutter ... details: Bit typeMain bit size(mm)Rock coefficientPDC core drill bitSingle pipe75/54.5 94/74 113/89 113/109 ... ,215.9,244,311,445Typeall kinds and size PDC bitsApplicablewater well, oil field, construction, geothermal, directional boring, and underground foundation workFormationsticky, ...