OHD-MAT4 ORTHO METAL ANT BAIT STATION, 4 PACK The Ortho Home Defense Ant Bait uses four food sources to attract and eliminate ants at their source. Kills the Queen – Kills the Colony. It starts working within 24 hours. Effective against a wide range of ants found in kitchens, patios, yards, and gardens, including Acrobat, Allegheny, Argentine, Big-headed, Cornfield, Crazy, Ghost, Little Black, Odorous House, Pavement, Pharaoh, Pyramid, Thief & White-footed Ants. (Excludes Fire, Carpenter & Harvester Ants) Child-resistant and easy to use, these bait stations can be placed along baseboards, in corners, on countertops, under appliances, sinks, around pipes, in the pantry, on window sills, near garbage cans, and along ant trails.