In article . com,
"Weatherlawyer" writes:

Jonathan wrote:

So, the tv isn't THAT heavy, but the concrete is just not giving! I drilled
a smaller pilot hole (took 5 minutes to go 1" with a 5mm bit) but when it
came to the 8mm bit, really nothing was happening. I gave up after about 15
minutes and 3mm having gone slightly deaf!

It sounds like you had found the steel. Even an SDS won't drill through
that.

Oh it will -- rebar in concrete is not a problem for SDS.
Of course, that's a really bad thing to do in a lintel,
where you often have only a single rebar anyway.

--
Andrew Gabriel