Lag shields are a screw type anchor designed to be used with lag screws. Short type shields are used in harder masonry materials to reduce drilling time. The long version is used in soft masonary to develop better holding strength. For use in concrete or mortar joints of brick or block walls. Drill hole size embossed on shield to the depth of embedment required plus 1/2". Clean hole of dust after drilling. Tap in anchor until head is flush with surface. Apply lag screw and tighten.