Using this bug catcher indoors will defend against six- and eight-legged pests. TERRO Spider & Insect Traps feature a sticky glue surface that effectively traps and kills spiders, ants, cockroaches, centipedes, and various crawling insects. They're ideal for tackling the "Big 3," including black widow, brown recluse, and hobo spiders. Once on the glue, insects are trapped securely. For convenience, each trap can be folded to keep the glue surface safe from pets and children, and captured insects out of sight, or used flat for a larger catch area. The traps are easy to use; simply remove the backing to reveal the glue surface. Fold the trap along marked lines to create an open box style or leave flat as needed. Position traps in high-traffic areas, such as basements and attics, or in rooms along baseboards, in corners, and under furniture.