A drill bit assembly for a rotary drill having a source of fluid under pressure and three bearing mounted rotary cutting cones for drilling into relatively hard material comprises an elongated housing with a first end adapted for engagement with the drill and a second end including {TAIL ~ the cutting cones} or tools for {HEAD ~ engagement} with the material to be drilled 
A drill bit assembly for a rotary drill having a source of fluid under pressure and three bearing mounted rotary cutting cones for drilling into relatively hard material comprises an elongated housing with a first end adapted for engagement with the drill and a second end including { TAIL ~ the cutting cones } or tools for { HEAD ~ engagement } with the material to be drilled
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