①. The tip, base and screws of the anti-bird spike are made of SUS304 stainless steel. It is not affected by extreme weather conditions such as rain, snow and heat. It has a longer service life than plastic or silicone anti-bird spikes. ②. The height of the anti-bird spike is about 11 cm, and the distance between the two ends is adjustable. You can adjust the gaps of the bird nets according to their size to prevent birds from climbing or nesting. ③. If you use the bird nail, it can protect the balcony, garden, roof, window or gutter from pigeons, crows, swallows, herons and other birds invading them. It can also be used as a cat trap to scare the cat and prevent it from passing. ④. Pigeon Nails are composed of 20 pairs (44 needles) of 33 cm long pieces. A box contains 10 sticks. ⑤. The base of the pigeon spike has a row of pre-drilled holes that you can quickly install using zip ties and screws. The foldable and cuttable bird nail base fits any shape and length of mounting surface.