What drill kinda bit

[sawduster]

I need to drill some holes for a grab rail into the shower wall. The wall is cultured marble, and I don't know that a regular twist bit will work. Anyone know what the recommended bit is for this stuff?

[deathwish]

Masonry bit lubed with water from a spray bottle will do the trick. Go slow, with light pressure (NOT in hammer-drill mode if you have that), and rough the center spot with the tip of the bit before starting so it doesn't walk around on you.

[sawduster]

Thanks Mark, You da man. ;D

[TDHofstetter]

You'll be surprised just how SOFT that stuff is, if it's the stuff I'm thinkin' about. It'll drill right easy. I started to turn a pen from the stuff once, but it crumbled...

Yeah, it was tough on HSS tooling, too.

[rrich]

Masonary bit?

I'll second the lube with water also. (More to keep it cool.)

[woodmannie]

mix a little soap with the water. Dawn is perfect.
After ya get through the marble, go to a twist. Masonry bits like crete, etc. but not very good in wood.

Tom

[TDHofstetter]

Might wait till he gets through the cement board, if there's some there, though...

[cabinetman]

Cultered marble (resin composite) can be drilled with ordinary drill bits. Brad points work well. Lubricate with water.