PURPOSE: To easily produce a round bar of sintered hard alloy with a high- precision spiral holes at the time of producing the material for drilling with a spiral holes by extrusion by improving a nozzle and a jig to be set in the nozzle main body.

CONSTITUTION: A material having spiral holes or injecting a coolant such as cutting oil for the drill, end mill, etc., is produced from a sintered hard alloy by extrusion. In this case, a pasty material consisting of the powder of the sintered hard alloy and a plasticizer is extruded from a nozzle 1 contg. a spiral jig 2 through a supporting jig 3 to produce the material. The jig 2 for forming plural straight small holes at the approach of the nozzle 1 is extended close to the tip of the nozzle 1, a part is furnished to the jig 2 to reduce the nozzle diameter in steps, and one or plural couples of protrusions are extended to the nozzle 1 tip along the inner wall of the nozzle. A material for the high- performance drill is produced with a spiral holes precisely arranged in a sintered hard alloy round bar along the spiral cutting blade.