Aerosmith's Removable Zinc Nail-In Anchors are a light duty mechanical anchor whose body is made of zinc alloy and its screw made of carbon steel. Unlike the standard zinc nail-in, this product comes with a screw rather than a nail so that once installed, it can be removed. The product can be used in concrete, brick, block and stone and is easy to install. Pre-drill the same diameter hole as the anchor body, position fixture in place, tap anchor into pre-drilled hole. When flush, hammer the head of the screw into the body of the anchor. To remove, just back out the screw to release the expansion mechanism. This anchor should not be used in overhead applications.