200PCS Electric Fence Insulator Screw-in Ring Fence Post Poly Wire Tape Rope SetFeature: The screw of ring insulator is made of high quality metal, rust proof. The cover of the fence insulator is made of black plastic, which is extremely insulating, weather resistant. The slot design prolongs the life of the wire by holding it firmly in place and reducing wear, while the ring design allows the wire to be inserted with a simple twist. To avoid an electrical short circuit between the wire and the fence post, keep the space between