National Hardware's 3/8" x 16" Eye and Eye Turnbuckle is used to increase or decrease tension in wire and rope applications Extruded aluminum body provides corrosion resistance in harsh conditions. Easily add or remove turnbuckle tension using an adjustable wrench. For interior or exterior applications where variable tension on wire or rope is desired. Coated with WeatherGuard Protection to withstand harsh weather conditions and prevent corrosion National Hardware's Lifespan Limited Lifetime Warranty