Whitney Tool 25221 Style 110 keyseat milling cutter features 1-1/4" cut diameter with 9/64" cut width for precision keyway machining. Manufactured from M-42 high-speed cobalt steel with TiN (Titanium Nitride) coating for superior wear resistance and extended tool life. Ideal for cutting keyseats in shafts, hubs, and gears in industrial machinery and power transmission applications.