These fence and wall security spikes provide an effective, low cost deterrent against unwelcome intruders. They are also ideal for keeping your pets out of your neighbours garden and deterring unwanted animal visitors to yours. They can easily be fitted to the tops of fences, gates, walls, window sills etc. and are designed to deliver maximum discomfort to unwanted visitors, but minimum harm. The double hinge design cleverly allows easy fixing to angled surfaces and they are weatherproof, durable, reusable and recyclable. Now features bolt effect screw holes.