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34mm tapered drill button bits for coal mining bit. 34mm tapered drill button bits for coal mining bit. Adavantage : 1. Tugestun Carbide , same as Boart Loner . 2. Hot-Press . 3. Long serve life . Tapered bits, especially tapered button bits are the most popular Tapered Drill Bits with a wide selection of head diameters from 26mm to 48mm.
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