Simpson CD25400M 1 4" X 4" Mushroom Head Crimp Anchor Zinc, Pkg 100 DSC Drag Strut Connectors These blue coated screws are built These blue coated screws are built tough to deliver strong holding power without the hassle of anchors The LSTHD8 installs by securing the strap to the wall stud assembly and anchoring the holdown to the supporting foundation or framing member using approved fasteners and anchor bolts per Simpson Strong Tie installation guidelines Drill a hole using the specified diameter carbide bit into the base material to a depth of at least 1 2" deeper than the required embedment The low profile mushroom head works excellent for attaching wood or light gauge steel to concrete and grout filled block