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1. Circular arc brown, standard PDC cutters are distributed on the blades.
2. Cutters distributed optimized with balance design so that the stability and gain efficiency of drilling largely improved.
3. Column diamond is used in inner and outer gauge as protection, besides that extra PDC cutters are used to enhance gauge protection. Flow roomage is optimal designed so that bit can be clean and cooled sufficiently.
4. This series of bits are suitable for medium to medium-hard formation.