Samples please purchase from our Ali express shop: /store/101301 
pipe hole saw

1) Variable pitch teeth for faster, smoother cutting and less vibration

2) Longer lasting design for more cuts per saw

3) Long cutting life, for the builders, tile setters, home owners, do-it-ourselves,construction workers and other professionals
4)Can be used in portable electric or pneumatic tools, vertical drill machines, lathe, boring/milling machines and other machine tools;
5)Cuts through wall , brick and concrete,thin iron plate (thinner than 2.0mm)

6)We can be design as per your specification

7)Normal size:16,19,20,25,30,32,35,38,40,42,45,48,50,51,57,60mm