PDC Non coring bit 1.features of large torque, wide drilling range and durable 3.super long life 4.high drilling speed. PDC Non coring bit PDC non-coring bit is a kind of full face drilling bit,it is mainly used for coal mining,water conservancy and hydropower,construction of road and building. size outer diameter(mm)HBN55 Φ55HBN65Φ65HBN75Φ75HBN80Φ80HBN85Φ85HBN94Φ94HBN98Φ98HBN113Φ113HBN133Φ133 ...