... ,6,7,8,9,... 1,Application:1,Suit for drilling medium to medium-hard formations.2,Evolute asymmetrical blade cutter design and balanced ... ,445Typeall kinds and size PDC bitsApplicablewater well, oil field, construction, geothermal, directional boring, and underground foundation workFormationsticky, soft, medium hard, hard formationblade4,5,6 ...