Toggle bolts are intended for use on hollow masonry materials, such as concrete block. To use, drill a slightly oversize hole and push the spring-loaded toggle through. Once the wings have cleared the hole, they open up. As the screw is tightened, the wings are drawn up against the backside of the block. Toggles are good for light loads, although larger sizes can handle medium loads. The screw portion of the toggle can be removed but the toggle itself cannot be retrieved.
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