I agree with above (rjm1cc), in fact for the holidays I installed around 40 or more hooks in stucco with plastic inserts using standard concrete bits, regular power drill, with no problems at all.
I like the idea of the silicone of the outside installations, I will be going back to do this after the holidays.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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