Upgraded Bird Spikes: Adding small spikes beside long spikes makes birds unable to stand in the gaps of the bird spikes effectively. Alternative to barbed wire. ✔ Weather Resistant: The bird spikes are available in two materials, 304 stainless steel and hot-dip galvanized. Bird-proof spikes will not rust and can be used for a long time. ✔ Flexible Installation: We have included enough expansion screws to help you attach the animal spikes to any flat surface. ✔ Safety Protection: Metal spikes will give animals and people a warning to keep them out of your area, 100% Effective, safe, permanent solution. ✔ Multipurpose: Widely used in miliary areas, prisons, government agencies, banks, private houses, villa wall, doors and windows, highways, railway guardrails and border lines to protect security.