drill bit,drill bits,rock drilling tools,rock drilling tool,Button bits,rock drill,threaded,tapered,drilling tools, 1. Button bits: Tapered ... 310mm, The shank can be designed according to different hammer, for example: DHD Hammers series (DHD340, DHD350, DHD360 ... , Cop Hammers series (Cop34, Cop44, Cop54 etc.) , HD hammer series, Mach hammer series (MACH30, MACH40, MACH50, MACH60 etc) 3. Dth Hammers ...