The high-performance, engineering-grade ceramics provide a secure grip on all types of wire and have excellent corrosion resistance to sprays and fertilizers. The Gripple Wire Joining & Tensioning system significantly reduces the amount of time and labor needed to install and maintain your fence. No tying knots or crimping! Gripple allows you not only to join wire but to tension wire too. Each Gripple is fitted with a ceramic roller mechanism that allows movement in one direction only, resulting in the ability to always tension the wire.