Polycarbonate Pigeon and Bird Spikes - 4 Rows. The pre-punched polycarbonate strips are strong and durable and can be cut to size. Made of UV-resistant plastic, they install quickly without drilling. 4 rows of spikes protect areas up to 20 cm wide without harming animals. Technical specifications Material: UV-resistant polycarbonate Protected width: approx. 20 cm Stud thickness: 1.3 mm Number of spikes per 50 cm base: 40 Stud height: 12 cm Stud material: spring stainless steel Base length: 50 cm Base thickness: 0.5 cm Base width: 2 cm Number of holes in the base: 10 Installation The polycarbonate strips are breakable thanks to their pre-punched spikes. The spikes are easily installed using a special glue. The protected surface must be clean. It is recommended to treat the surface with a primer to ensure optimal adhesion. Installation can be done with screws or nails. Areas of application: Attics, shutters, balconies, window sills, shutters, lintel windows, ridges, dormers, cornices, gables, and awnings.