Block pest birds from their roosting and landing surfaces Bookmark Bird Spikes. Rugged, durable, polycarbonate material provides decades of maintenance free protection. March transparent material does not resemble a building. The ears function to keep-out sign for the birds. The peaks of density are branched vertical shafts to offer impenetrable coverage. Flexible tip can be mounted on almost any surface and can be easily installed with adhesive (included). Stackable 12 Inch sections make it easy to carry a quantity of nails, and help minimize waste. Each foot peaks covered in a linear foot, and the spread or width of 2 1/2-inch. Pests: birds (pigeons, sparrows, starlings, crows, blackbirds, blackbirds, gulls, swallows and more), bats, climbing animals and more. Use: frames, beams, joists, ralings, air conditioners, signs, parapets, gutters, roof perimeters, chimneys, support structures, tents, poles, lights, statues