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This is our R32 rock drilling button bits, model size is R32-45mm and R32-57mm with 9 round buttons. They are made by tungsten carbide buttons and steel. Round buttons are more wear-resistant when compared with ballistic buttons, and ballist buttons have fast footage. Except for R32 drilling button bits, we also supply 76mm, 89mm, 102mm, 127mm, 153mm with T38, T45, T51, GT60 etc standard sizes. When you send inquiry, please tell us the R32 drill bits model size, button shapes and rock formation. More information will be good for us to provide you an exact price.