Nylon Hammer Drive Pins (or just drive pins) are used in light duty masonry applications to attach fixtures to concrete, brick, block or stone. Used in lighter load applications, Hammer Drive Pins (or just drive pins) attach fixtures to solid concrete or certain types of concrete blocks. Using a pre-drilled hole, they are installed with hand tools, typically with a hammer strike, to drive the pin into the anchor body expanding the anchor to form a tight fit. The washer on the anchor retains the pin and guides it during the driving installation. Trade Names: Hammer Drive Anchors, Drive Pin Anchors, Hammer-Set Anchors, Nail Drive Anchors, Nail-On Anchors, Nail-On Drive Pins, Concrete Anchor Nails, Mushroom Head Anchors, Hammer Drive Hollow Wall Anchors