... ,more than five hundred types.They are Tapered drilling We supply rock drilling tools and mining tools,which include five series ... ,more than five hundred types.They are Tapered drilling tools,Threaded Extension drilling tools,Down the hole tools,Tricone bits and ... Latent-hole Bits,Latent-hole Rod,Coal Cuter Drilling Tools,Pneumatic Drill Rods,Integral Drill Rods etc.) we can also produce other products ...