Easy Grip nylon hanging mesh gives bats a place to easily grip for hanging. Unlike metal mesh, nylon will not rust or corrode and will not scratch or cut bats. Landing skerfs on the extended base of the house make it easier for bats to land and climb into the house. Stainless steel screws are used in the construction of this bat house to ensure a secure, durable, and safe habitat for your bats to use for many years. Holds up to 300 bats; 20.5" x 12" x 5" Extensive research shows that multi-chamber bat houses have higher occupancy rates than smaller, single-chamber designs.