Turn nearly any fence that is 5 ft or taller into a cat-proof barrier with the Existing Fence Conversion System. Pivoting fence extensions are installed along the top of the fence with durable poly mesh material stretched between them and secured in place with included zip ties. Secure the bottom edge of the mesh to your existing fence and your cat-proof barrier is complete. Each 100 ft kit includes: 12 - Spring-Loaded Arms 12 - Mounting Plates 12 - Set Screws 100 ft of 4 ft tall Durable Poly Mesh (600 lbs Breaking Strength) 1 bag of UV-rated zip ties (100 ties per bag) 2 sets - Arm to Wall Hardware Written Installation Instructions Note : Fasteners for installing mounting plates to an existing fence, wall, building, etc. are not included. Fasteners should be chosen based on the fence type, or the material of the building, wall, etc. Keep in mind that every fence is different and some configurations may require fewer or more components than those included in the kit. Each kit includes components for the average fence of 100 linear feet with extensions spaced 8-10 ft apart. For example, important areas to consider that may require additional components are gates, corners greater than 180 degrees, and endpoints. Multiple kits can be purchased for larger fence configurations.