Defender Stainless Steel Pigeon Spikes Kit | 20 Feet with Glue | Bird Control Guide | Various Size Kits Defender Bird Spikes stop pigeons & birds landing, perching or roosting on ledges up to 4 inches wide 20 Feet Kit includes - 18 individual bird deterrent strips & 1 Defender Silicone Glue Includes 40 page Defender pigeon deterrent guide & Defender 25 year warranty certificate Each pigeon repellent strip is snappable to size | Glue, screw or zip tie down Steel anti-roosting spikes | 304 Grade Stainless Steel Spike on a UV Stabilized Polycarbonate base Our standard Defender Plastic Bird Spike is for light pigeon infestations on ledges up to 4 inches wide. This means an area where the pigeons come and go during the day, but are not trying to nest or roost overnight. For a heavier infestaion where pigeons are already established and are trying to nest, we would recommend the Defender Stainless Steel Bird Spike for ledges upto 4 inches.