Review on Strong and Reliable: Hillman 370980 Anchor 4 Inch 40 Pack for Secure Fastening by Dee Parson

I used 20-25 of these wedge anchors to attach my new steel railing to an existing concrete porch and brick home. You work like a champ. Only one out of the whole group couldn't resist, but at 4 per post it's not a problem. I would consider a 95% success rate to be pretty good. BTW I used a hammer drill which drilled very clean holes and vacuumed them before installing the anchors. In my experience, these two conditions are necessary for success with all anchors.