Powers' 1/4" X 3" Nylon Nailin Drive Pin Anchors (100/BX) (02573) are nail drive anchors with bodies formed from engineered plastic and from drive nails (available in carbon and stainless steel). These anchors can be used in concrete, block, brick, or stone. They are pre-assembled with either a carbon steel or stainless steel nail but are not recommended for applications overhead. For overhead applications, please refer to the Zamac Hammer-Screw.