| Retrac button bit are made by high quality alloy steel bar and tungsten carbide, through heat treatment to improve products surface hardness to improve the drilling speed , Button Bit designs include; Standard, heavy duty, drop centre, ballistic, parabolic and retract and combination options. Available with all popular international thread forms such as R28, R32, R38, T38, T45, T51 ,T60£¬ST58£¬ST68.which can be equipped with rock drilling machines such as Atlas Copco, Boart Longyear, Sandvick, Ingersoll-Rand, Furukawa and so on. |
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