In message , Gordon Henderson
writes
So I have new Acrylic bath, new mixer tape for it with what I'm sure
is 3/4BSP threaded tails. (To be connected to 22mm pipe)

And I need to drill holes in the bath to make it fit.

What size drill do I need?

Err, big enough for the tail to fit through? 22-25mm I guess without
measuring a fitting.

Or do I use a hole saw sort of thing?

Hole saw is probably best, but I've drilled them ok with a spade type
wood bit. Just don't go to fast.

The
chuck on my Bosch is only 13mm too...

Doesn't mater, the shafts of the drills etc. are sized small enough to
fit.
All advice appreciated!

Gordon

--
Chris French, Leeds