On Nov 2, 8:43 am, JB wrote:
On Nov 1, 10:20 pm, 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.

They have coping saws with round carbide-covered blades.

--Jeff


Or how about one of the roto-zip type spiral saws?