Harris Famous Boric Acid Roach Tablets formula with added lure, kills Roaches, Waterbugs & Silverfish. Just place tablets in out-of-the-way areas where roaches travel and roaches will find them. One box can treat an entire house, making it one of the most efficient and cost-effective ways to kill a roach. Roach Tablets are a compressed pellet of Boric Acid and other ingredients to create an irresistible attraction for roaches. Perfect to use in out of the way places that roaches are hiding. Such as under and behind refrigerators, stoves, sinks, tubs, dishwashers, washing machines, dryers, into openings around drains, water pipes and electrical conduits, and in cracks and crevices along baseboards and corners of cabinets, cupboards and closets.