The Rhino black egg insulators are best suited for medium strain use. This egg is perfect for nearly all sizes of fence wire. The unique shape of the egg holds the wire in the correct place and prevents twisting or kinking of the wire. The plastic egg has been UV stabilised to ensure longevity. Sold in a pack of 20, these eggs are easily installed and prevent any unnecessary earthing of wire. The egg is designed to prevent arcing and voltage loss.