Barbed Wire Arm 10Pack 310mm Fence Post Height Extender Surface Mounted12. 2" Fence Height Extension: The package includes 10 fence post extenders that raise your fence height by 12. 2 inches. These barbed wire arms are ideal for boosting security and privacy on farms, yards, and gardens while preventing pets from jumping or escaping Heavy Duty & Weather Resistant: Built from thickened steel, these fence extension arm offers excellent strength and impact resistance. The powder coated finish provides excellent corrosion