2 1/2 in x 3/16 in DeWALT Spike Mushroom Head Tamperproof Pin Anchor
Tanner - Spike Anchors are one-piece, vibration-resistant pin anchors for use in concrete, block, or stone. Available in several head styles, including tamperproof versions and anchor materials. Spike anchors are pre-formed, no
DFS Security Anchors - Diversified Fastening Systems, Inc. - DFS/USA