Lag Screw Shield Anchors are designed for light to medium-duty fastening into concrete, brick, or block. They are made of rustproof zinc alloy and work with lag screws to provide strong holding power. The anchor expands as the screw is tightened, creating a secure hold in the base material. A short shield is recommended for harder concrete to minimize drilling time, while a long shield is ideal for softer masonry for maximum holding power.