Hillman 1/4 in. D X 3 in. L Steel Mushroom Head Spike Anchors 50 pk

The Spike Anchor is a patented, one-piece, tamper-proof anchor for use in concrete, block or stone. The Spike anchor is formed with an s shaped configuration at the working end of the anchor to create an expansion mechanism. Since the anchor is pre-expanded, there is no secondary tightening position. *