INNOVATIVE DESIGN: Barbed wire extension arm is made of Q235-galvanized steel with professional outdoor frosted high temperature powder coating on the surface, It is well protected from rain and humid environment, Waterproof and Rustproof. Post extension arms are equipped with five runway grommets respectively, Which can easily snap the wire barbed wire into the rings, Convenient and Fast, Compared with the traditional fence post extender, Hulave post extender is your best choice in terms of both practicality and aesthetics WIDER APPLICATION: The Fence Post Extender extends the height of your fence vertically by 32", For Wood post/Concrete wall fences (Concrete walls require replacement expansion screws - Not included), Whether you want to add height to your fence for privacy and security, Stop animals from jumping away and breaking in, Or hang festive ambiance decorations such as string lights for the holidays, Extension arms will be the perfect addition SIZE SPECIFICATION: Height 32" Base plate: 3.5"x4" , Snaps into cord Maximum Diameter: 1/2", Qty: 8 Pack EASY TO INSTALL: Fence post extenders are easy and quick to install; 1. Place the extender bracket in the pre-installed position on the top of the fence and mark the pre-drilled holes with a marker pen; 2. Drill the pre-set holes with an electric drill and screw in the screws (the drill bit and the socket are included in the set); 3. Snap in the barbed wire or string lights, etc., you want to hang, into the runway grommets on the post to complete the installation SET INCLUDES: Includes all accessories and screws to support your quick installation; 12 Fence post extensions; 48 Hexagon socket head cap screws (Φ5/16" L/2"); 1 Drill bit (3/16" diameter); 1 Socket. (Note: If installed on a concrete wall, You need to replace the expansion screws (set is not included) - Recommended expansion screws Φ3/8", L: 3", Hammer head drill bit Φ1/2") Note：This set comes with screws for wooden fence walls. If you install a concrete wall, You need to replace the expansion screws (set is not included) - Recommended expansion screws Φ3/8", Length: 3", Hammer head drill bit Φ1/2".