PRECISION Punches with Key Grooves, with Air Holes Normal, Lapping

In addition to the keyway for inserting the key, this is a precision grade (coaxiality 0.005, roundness 0.003) keyway/air hole punch with a hole for air to pass through inside the shaft. Materials can be selected from high-speed steel and powdered high-speed steel. You can choose between normal type and lap finish.