Prevents birds from landing on roofs. Mounted on surfaces which need to be protected from birds landing or roosting overnight, e.g.on roofs, window ledges, above recesses, signs, beams and pipes. Extremely effective against seagulls, pigeons and crows. These bird spikes are discreet and difficult to detect from the ground. They consist of a plastic base with outwards stainless steel metal ribs that splay outwards. Fitted with screws or cable ties. Two variants are available, with 5 spikes and 4 spikes.