PDC Drill Bits PDC drill bits: New products with super long life, high efficiency and wide application. 1) Super long life-as 10 times as cemented carbide drill bits under the same condition. 2) High efficiency-Times of lifting the drilling machine could be reduced sharply, and the average time efficiency could be increased more than 2 times. 3) Wide range of application-it could have a penetration of rock formation with f d12, especially for the rock formation with f= 5-10. 1. PDC drill bits ( non-core bits) Application for penetration of gas hole, water-discharging hole, and grout hole under coal mine. Size: dia 48-dia 270mm Concave model, Pillar model, Blade model, Expansion model 2. PDC Drill bits ( core bits) Application for core drill of coal system stratum with hardness coefficient f