5/16\-18 Double Expansion Shields (Pack of 12)
- Zamac Zinc Alloy Concrete Anchors for Masonry Screws or Bolts.
- Four Part design: a two-piece tubular shield, a hollow, wedge-shaped cone and a wedge-shaped nut-- brought together into a single anchor unit.
- Used in soft masonry with machine screws or machine bolts.
- Can also be used in harder materials, including stone, brick, concrete or block.