Viking Die Grinder 1/4" Drill Chuck 25,000 RPM, Motor: 1/2HP. 5 CFM, Air Inlet Size: 1/4" NPT 25,000 RPM vibration-free performance for heavy-duty applications Front exhaust design allows for additional assistance in clearing work area of chips. Ergonomic pistol grip allows for greater comfort and easy access to confined work areas. Free Speed: 25,000 RPM, Motor: 1/2HP, Average Air Consumption: 5 CFM Air Inlet Size: 1/4" NPT, Chuck (3-jaw Drill or Collet): 1/4"