I agree with one other poster. Sometimes when you are drilling cement
with small stones,a STAR drill works good when used in conjunction
with a regular masonary drill. When your regular masonary drill hits a
stone and stops making progress,then use your STAR drill with a hammer
to break-up the stone before continueing with your electric
drill.Renting a Hammer drill is to expensive and over-kill for doing a
small job like yours! Good luck! been there done that!
I've used masonary bits, not all that epensive, for years for general
drilling in concrete with no problem. I've gone as large as 3/4" for with
my 19.2 volt cordless and get a good clean hole. It sounds like you are
trying to use a regular bit that would be for wood or metal. Ask for a
masonary bit at the hardware. They look a little different than a standard
I often use a particular lead anchor that you 'set' into the hole with a
special tool. It is theaded for a regular bolt. Since you setting the
anchor first rather than asking the bolt to pull it tight, they seem to hold
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