Originally Posted by
sxtasy
Do you know the thickness of the concrete wall? Most wedge anchors will not be long enough for this application. You can use redi rod/washer/nut for this application and anchor them in using two part epoxy anchoring adhesive (ie. hilti hit, Simpson makes a good epoxy). Follow the epoxy manufacturers directions for hole size and cleaning method. I have used this for installing engineered glass railings on concrete decks.
Figure 4" for concrete embedment, 4" post thickness, 1" for washer/nut. So 9" redi rod, or make them longer and cut the excess off after. 2 bolts, top and bottom for each post. Top hole should be at least 3" below top of concrete so you don't blow the top out when drilling.
Edit: the countersink suggestion is a good idea too