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This series of PDC diamond drill bits is specially designed for drilling hard rocks of IV-VII hardness categories. These bits use cutters with increased impact and abrasion resistance. The specially designed bit profile and optimally selected number of blades ensure maximum cutter overlap, protecting the bit from premature wear. To improve stable bit behavior at the bottomhole, a spiral blade shape is used. The set of design solutions implemented in these bits allows achieving maximum speed, penetration rates, and excellent controllability during well drilling.