Barbed wire is the most cost-effective way to secure a perimeter, but not all barbed wire is the same. The "pitch" (spacing of barbs) and "gauge" (wire thickness) define its application.

　　Types of Barbed Wire

　　Single Strand: One wire with barbs. Used for temporary fencing or interior boundaries for livestock. It is easy to install but offers low security.

　　Double Strand: Two wires twisted together. This is the standard for agricultural fencing (cattle/horses). The double strand creates a psychological barrier and is harder to break.

　　High-Tensile (HT): Made from high-carbon steel. It doesn't stretch. If an animal leans on it, it doesn't sag. It requires special tools to crimp and is dangerous to handle without gloves.

　　Reverse Twist: The strands twist in opposite directions to prevent the wire from unraveling if cut. This is used for high-security boundaries.

　　Barb Spacing

　　Close Spacing (3-5 inches): For containing small livestock (sheep/goats) so they don't get stuck or jump through.

　　Wide Spacing (6-10 inches): For cattle. It inflicts more pain per inch, deterring large animals from pushing through.

　　Coating

　　Galvanized: Silver color. Lasts 20-30 years. Resists rust.

　　Polymer/PVC Coated: Black or colored. Lasts longer in acidic soil but the coating can hide rust underneath if scratched.