"Matthew" wrote in message
ups.com...
Hi All,

Im looking for some recommendations for core drills.

I need to drill two holes through brick walls in order
to install two 4" extractor fans. I have a bosch sds plus
drill but havent used core drills with it before.

I guess there are two types diamond and tungsten teeth.
Not sure what make or what accessories are needed.
Its only the two holes so I dont want to spend too much.
Any advice?

A consumer SDS drill is a bit of a compromise for a 4" hole. Bit too fast
for a 4" diamond core and not enough hammer for a tungsten core. I
virtually guarantee the tungsten will do little more than scribe a circle.

For a true one-off stitching a circle with a 10mm or 12mm SDS drill is as
good a way as any. If a clean cut is really important a 4" diamond core
will just about work with a good SDS drill if you can lean into it enough to
make the teeth just bite unless the brick is really hard. Hire if you trust
the hire shop not to charge you for wear.

Jim A