These Pest-Stop Professional Bird Spikes can be fixed to window sills ledges guttering & walls etc. They are excellent at discouraging birds & can prevent birds from landing. Supplied in handy 50 cm. strips the Bird Spikes are easy to fit & highly effective. The tough steel spikes are fitted on a strong but flexible plastic base which is easy to cut to required size & easy to fix with screws or glue. Supplied in a pack of 10.