Ring insulator screws are made of high-quality Material and are rust-resistant.The outer cover of the guardrail insulator is made of plastic, which has strong insulation and weather resistance.The slot design extends the life of the wire by holding the wire securely in place and reducing wear and tear, while the loop design allows the wire to be inserted with a simple twist.To avoid electrical shorts between wires and fence posts, maintain space between wires and posts.Style:A blackMaterial:plastic + carbon steelcolour:BlackPackage Contents:100 * black insulatorOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.