The Defender 8 Plastic Bird Spike is an effective pigeon deterrent method to protect shop signage, ledges, windows and other areas. Easy to install, pigeon infestations will soon clear up when they can't perch or roost on their desired location. These plastic spikes offer coverage for 200mm (8 inches) and can be bought in packs of 10, 100 or by the meter to ensure you have enough spikes to stop your pigeon problem for good.