Check the listing for details. Cat Bird Repellent Spikes Outdoor Fence Spike Plastic Deterrent Climb Strips. Condition: New. Listed at 20.45 USD. Feartures CAT & BIRD REPELLENT DEVICES - Simply screw on a fence or stick them to a wall to protect your house ANTI-CLIMB SPIKES – effective deterrent spikes to guard against intruders without causing harm. INSTALL ANYWHERE– cat repellent outdoor plastic strips - install on top of any flat surface! SNAP TO FIT – bird spikes kit splits every 6 inches to fit on all lengths of fence & boundary. Various Ways To Install 1.Screws-For the cement or wood wall, use an electric drill to put the screws in the hole and fasten the spikes 2.Zip Tie-Secure the strips with strong zip ties instead of nails or screws which causes permanent damage to the fence 3.Double-sided tape-Use the double-sided adhesive tape to secure the spikes on fences to prevent any damage on your fence Package Content 12/24 strips