Concrete nails bear a passing resemblance to wood nails, but they have thicker shanks that frequently have vertical ribs for easier penetration. Because they are made of hardened steel, they pose a danger to the person driving them -- because striking one with a hammer also made of hardened steel, such as a framing hammer, has the potential to send tiny shards of metal flying through air. These shards can penetrate skin and injure unprotected eyes. Safety precautions include wearing eye protection and gloves, as well as driving the nails with a small sledge hammer, which is made of softer steel than a framing hammer, so it doesn't shatter and throw off metal splinters.
Drill a pilot hole into the concrete wall, using a drill and masonry bit. The hole should be the same size in diameter as the masonry nail anchor. Insert the anchor into the hole so the top rim is flush with the surface of the wall. Hammer the nail into the anchor. Masonry nail anchors will hold light to medium weight objects such as furring strips or metal framing. They are not removable once the nail has been driven.
