t45 thread button bits 1) best quality alloy steel bar and tungsten carbide buttons, 2) Thread: T38,T45,T51 t45 thread ... through heat treatment2)Suitable for all kinds of rock—Soft rock, loose-medium rock, hard rock and any other special formations,3)Thread: R22, R25 ... drop center face Thread button bits can be equipped with rock drilling machines such as Atlas Copco,Boart longyear,Sandvick,Ingersoll ...