Crimp Drive Anchor, Carbon Steel Zinc Plated, Head Style Mushroom, Anchor Dia. 3/16 In, Anchor Length 1 1/4 In, Min. Embedment 7/8 In, Ultimate Tension in 4000 PSI Concrete 1000 Lb., Package Quantity 100 Crimp DrivePreformed curvature along shaft expands to secure anchor. Installs with a standard hammer into concrete and grout-filled block.Split and CrimpSplit, Crimp, and Hammer-Drive AnchorsTamper-resistant light- to medium-duty allow hammer-in installation and multiple head configurations. Install in concrete, grout-filled block, and stone. Duplex-head anchors are for temporary fastening and can be removed using a claw hammer. Sup-R-Coat electroplate and galvanized finishes are for use in corrosive environments, or with ACQ lumber.