Physical barriers are effective way to keep birds off. These spikes deter pigeons, seagulls, crows, and similar-sized birds. Each bird spikes has 15 pins and 40 points. The position of each anti-bird nail is carefully designed to ensure that the animal is effectively driven without hurting the animal. The first step prior to installing bird spikes is to clean and dry the area where bird spikes will be installed. Due to the infectious diseases associated with bird feces and debris, be sure to use extreme care when removing nests and bird droppings. Please note stainless steel spikes are not recommended for nesting birds or small birds.