Bird spines can prevent any type of bird from landing and sitting on windowsills, gardens, fences, roofs, and other areas, so they do not build nests in these areas. Very suitable for small, medium, and large birds such as sparrows, swifts, mockingbirds, pigeons, seagulls, and other birds. In addition, these bird spines are also suitable for squirrels. Easy to assemble and install - this set of pigeon nails can be disassembled. Just insert the spikes into the base, and then place the bird spikes in the place where the birds reside, build nests, and defecate. Each Flat noodles has 4 holes (0.315x0.216) for installation. You can fix it with zippers, screws, double-sided tape, building adhesive, etc. These bird nails, suitable for both small and large birds, can be removed when you don't need them or kept in place throughout the year. The metal spikes of bird spikes are very hard. The metal base is hard enough to stay straight, but you can bend these stainless steel bird nails to fit the inside and outside corners, or cut them into shorter spaces. Hacksaws/metal plate shears/scissors/wire cutters can cut off excess parts on sharp edges.