STOPS INTRUDERS AND SMALL ANIMALS: Easily fitted to the tops of fences, gates, walls and window sills, these security spikes provide an effective, low cost deterrent against unwelcome intruders as well as squirrels, pigeons and other small animals. VERSATILE: Fully weatherproof, durable and reusable, these anti-climb spikes can be cut to the required size or placed side by side for wider surfaces. PRE-DRILLED HOLES: Each strip measures 490mm (20") long, 43mm (1.7") wide and 19mm (0.7") high and has pre-drilled 4.8mm (3/16”) fixing holes (more holes can be drilled if required) .