Normal size:16,19,20,25,30,32,35,38,40,42,45,48,50,51,57,60mm easy to drill metal panel hole saw cutter1) Variable pitch teeth for faster, smoother cutting and less vibration2) Longer lasting design for more cuts per saw3) Long cutting life, for the builders, tile setters, home owners, do-it-ourselves,construction workers and other professionals4)Can be used in portable electric or pneumatic ...