The Hillman Group 370989 Wedge Anchor, 1/2 X 4-1/2-Inch, 10-Pack

Product Description Power fasteners power stud anchor. Steel/zinc-plated. For use in concrete, stone, brick, and Block. Ideal for medium to heavy-duty loads. Drill hole same diameter as anchor. Exact hole depth is not required. From the Manufacturer The Power-Stud is a torque controlled, wedge expansion anchor that is designed for concrete applications. Has various DOT approvals including Cal Trans listing for "Stud Mechanical Expansion Anchors". It is building code approved, and can also be used with treated lumber.