【Effective Bird Repellent】: The anti-bird spikes at 3 rows provide effective protection against birds installed on the roof, balconies, gutters or railings, effectively prevent birds such as pigeons and swallows from landing on beams, awnings or window sills and nesting there and leaving disgusting bird droppings! 【High Quality and Durable】: The tip and base of the anti-pigeon spike are made of high quality plastic. It is not affected by extreme weather conditions such as rain, snow and high temperatures, resists ultraviolet rays and has a long service life. 【Easy Installation】: There are a row of pre-drilled holes at the bottom of the anti-dove nails, which can be fixed with screws, or the balcony anti-bird can be fixed on the surface with cables or double-sided tape for easy movement. You can even cut it into small pieces for use in tight spaces. 【Anti Pigeon Balcony】: If you use anti-bird thorns, it can effectively prevent your balcony or gutter from being invaded by other windows,