1. Prevent bird and breeding problems - Bird spikes can prevent all types of birds from landing and perching on window sills, gardens, fences, roofs, and other places, so that they won't build nests there. They are very suitable for small, medium, and large birds, such as sparrows, swallows, robins, pigeons, seagulls, etc. In addition, these bird spikes are also suitable for squirrels and raccoons. 2. Easy to assemble and install - This pigeon spike set is disassembled. Simply insert the bird spikes into the base and then place the bird spikes where the birds roost, nest, and perch. There are 4 holes (0.315 x 0.216 inches) on each strip for installation. You can use zip ties, screws, double - sided tape, construction glue, etc. to fix them. These bird spikes suitable for small and large birds can be removed when you don't need them or remain in place all year round. 3. Weather - resistant stainless - steel structure - The bird - proof spike strips are made of the highest - quality 304 - grade stainless steel, which will not rust or weaken due to weather changes and will not leave unsightly rust marks on your property. These stainless - steel bird - proof spike strips are long and have reasonable spacing, which can effectively prevent birds from landing. Each strip is 13 inches long and 1.15 inches wide. The top of the spike strip is 2.15 inches wide, and the depth from the bottom to the top is 4 inches. 4. Standard size, but can be cut or bent for a better fit - The metal bird - proof spike strips are very strong. The metal base is hard enough to stay straight, but you can bend these stainless - steel bird - proof spike strips to fit inside and outside corners or cut them to fit shorter spaces. You can use a hacksaw, metal shears, scissors, or wire cutters to trim the excess parts of the spike strips. 5. Humane and effective bird spikes - 100% guaranteed - The bird - proof spike strips will make the birds feel uncomfortable when landing on them. The bird spikes are designed to drive birds away in a humane way.