the anchor falls away once you remove the bolt from the wall

frictional fit restricting movement of the screw when it is subjected to vibration

1/2 x 4 Mushroom Spike Zinc Plated (25)

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Conform to ASTM F837

1/4-20 x 3 1/4 Simpson STB2 Wedge Anchor 304 SS (100) Flat Mushroom Toggle Bolts Zinc Plated the anchor falls away once1 4 20 x 3 1 4 Simpson STB2 Wedge Anchor 304 SS (100) . WEDGE ALL wedge anchors are a non bottom bearing, wedge style expansion anchor for use in solid concrete or grout filled masonry. A one piece clip ensures uniform holding capacity that increases as tension is applied. The threaded stud version is available in eight diameters and multiple lengths. A single size tie wire version is available for wire supported fixtures. Threaded studs are set by