fischer DuoPower 8 x 65, Powerful Universal Plug with Intelligent 2-Component Technology for fastenings in Concrete, Bricks, Stone, etc, 50 Plugs Without Screws

Used these to hang a large mantel on a rough, split concrete block fireplace. These puppies went right in and did exactly what I hoped they would. The L-Bars are not going anywhere, and neither is the mantel. I just used the right cement drill bit and impact driver to place the plug, and the correct sized screw. Remarkably easy. I gave the rest of the box to my friend who was helping with the installation, and ordered a set of shorter plugs for other projects around the house.

These are great for when you have something very heavy, have a concrete or brick wall but it's covered in an inch of drywall or sheetrock. Drill the appropriate length hole and these are long enough to go past the drywall and secure to the brick or concrete.

Only 19 in box --should be 20