QUALITY DESIGN: Barbed wire extension arms are made of galvanized steel with high temperature powder coated baked enamel finish which can extend your fence height vertically by 23.5 “. The Wood Fence Post Extender is equipped with four separate runway grommets that allow you to easily snap wire barbed wire/wire light strings/nets into the rings for convenience safety and speed. WIDE RANGE OF APPLICATIONS: The Fence Post Extender is suitable for wood concrete wall fences expansion spiral needs to be replaced – not included whether you want to increase the height of your fence to protect privacy stop your pets from jumping and escaping or hang holiday lights and other festive atmosphere decoration the extension arm will be the perfect addition. EASY TO INSTALL: The installation of the Fence Post Extender is simple just put it on the fence that needs to increase the height drill pre-set holes to screw in the screws and then snap the iron barbed wire or string lights to be hung into the runway grommet on the post installation is completed. SET INCLUDES: Set includes all accessories and screws for immediate installation 8 Fence Post Extensions Brackets; 32 Hexagonal Screws 5/16″ Diameter Length/2″; 1 Drill Bit 3/16” Diameter; 1 Socket.