"Manster" wrote in message
...
wrote:
Durock, hardi-backer, wonder board etc. I assume some type of carbide
drill bit but what is it called? Holes big enough for pipes and
shutoff vales. Thanks.


"Hole saw"

you can do it either way but I've found it easier to punch it with a hammer

http://www.cgcinc.com/pdf/howtos/EDR_6209.pdf