"Thomas G. Marshall" . com
wrote in message news:iEyyg.1197$sy2.957@trndny01...
Steve B said something like:
wrote

[snip]

It's worth mentioning that these masonry screws you are referring to
actually tap out (as in carve) the threads needed as they are turned. As
mentioned though, you must first drill a hole.

*In my experience* you should *not* use the ones which look like merely
blue Philips head screws. Use the ones which have a hex cap on them and
use a socket wrench: the Philips heads are just too hard to keep a Philips
bit or driver in---the concrete provides too much resistance. Again, IME.

[snip]

It's easier if you use the proper drill size, then rub the screw threads
with a little paraffin or soap before installation -- either style Tapcon
should go in easily. Regards --