Amdro Ant Block home perimeter ant bait kills ants outside so they can't come inside. Ants think this specially formulated bait is food, so they carry it back to the colony to share. Once the queen and other ants eat it, the whole mound dies. Use it on lawns, landscaped areas or around structures to rid your home of ants. | Amdro Ant Killer for Outdoor Home Perimeter | Size 24 oz