1.Rock tools for furnace 2.Long working life 3.ISO9001 certificate ... . Export to many countries We are a professional manufacture of rock drilling tools, mining tools, DTH Drilling tools. construction tools and ... rods in most lengths.button bits, cross type bits and chisel bits with(6,7,11,12 degree taper).Bit diameter ... , Cross type bits, button bits and X type bits etc) rock tools for furnace