... tungsten carbide buttons, 2) Thread: T38,T45,T51 t45 thread button bits Features:1)Thread button bits are made with ... -medium rock, hard rock and any other special formations,3)Thread: R22, R25, R28, R32, R35, R38, T38, T45, ... design: flat face, dome face, drop center face Thread button bits can be equipped with rock drilling machines such ... ,Ingersoll-Rand,Furukawa and so on t45 thread button bits