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Pneumatic Rock Drilling Thread Button Bit R25/R28/R32/T38/T45/T51. Customized Drill Bits: Available according to different drilling applications for soft, medium, and hard rock. High Quality Materials: Made from high quality alloy steel bar and tungsten carbides with heat treatment. Wide Diameter Range: Available in diameters from 32mm to 152mm to suit various drilling needs. Fast Delivery: Delivery within 25 days after receipt of advanced payment. Multiple Color Options: Available in Red, Blue, Black, and Yellow colors. OEM and ODM Service: Full OEM and ODM services available with 2 R&D engineers. CE and SGS Certified: Product meets CE and SGS standards for quality and safety.