These are beautiful, durable stainless steel wedge anchors. I used them to attach a flag pole mount to a solid concrete wall. Previously used Tapcons and these plastic wall anchors, both times the bracket fell off after a few months. Bought 1/4" 2-1/4" anchor, used a 1/4" concrete drill bit with impact drill, drilled 1.25" deep holes. Only 2 anchors used to attach bracket (top left and bottom right). I I had to slightly enlarge the hole in my flag pole bracket with a 1/4" bit. Nutting and Tightening Easy and Safe!