... bits, cross bits, retrac bits, chisel bits, coal bits etc., used for rock drilling machines. We manufacture rock drill bits and machines used in mining and constructionButton bits ... 115 with thread R25,R32,R38,T38,T45,T51 Chisel bits:Head 32 / 34 / 36 / 38 / 40 ... 22,24,25 and the taper 12°,6°,7°Cross bits:Head 32 / 34 / 36 / 38 / 40 / ... ,25 and the taper 12 °,6°,7° Retrac bits:Head 51 / 64 / 76 / 89 / ...