MATERIAL ：Made from high-grade Metal, these Anti Climb Fence Spikes are designed to resist rust and damage, providing long-lasting protection for your property in all weather conditions. USAGE FUNCTION:These Security Spikes serve as a strong Intruder Deterrent, effectively preventing trespassers, squirrels, and birds from climbing over fences, walls, or rooftops. APPLICATION SCENARIO：Install these fence spikes on fences, gates, walls or rooftops to deterrence uninvited guests. They are highly effective in deterring birds and animals from entering, ensuring the safety of various surfaces. EASY TO INSTALL：These Heavy Duty Spikes are easy to install with pre-drilled holes, allowing for quick attachment using screws on any flat surface, including fences, walls, and rooftops. PREVENT CLIMBING AND CROSSING：From residential homes to commercial buildings, these Roof Spikes provide a reliable defense against intruders and animals. Their sharp design and durable construction offer comprehensive security. It is made of metal and has two anti-rust processes. It is very sturdy and not likely to bend or get damaged. The total length of 25.6 inches is composed of 13 sections each with a length of 1.96 inches. It is suitable for guardrails made of all materials such as metal, concrete and wood. It is equipped with two types of screws and one type of plastic screw sleeve which can be driven into the concrete to make the screws firm. If you don't want to install it with screws, you can use additional glue and metal cable ties for installation. The product comes with an installation instruction manual. Please read it carefully for a better installation.