Poolzilla double springs are the best way to fight against warping and bending. The double coil design of the spring adds durability and strength to your pool spring. The spring measures 8" long and comes with a D ring. Poolzilla pool cover hardware is made with the finest and most durable metals. Our hardware is factory tested to outlast even the harshest conditions, ensuring durability and safety of your pool cover all winter long. Rough winter conditions are no problem for Poolzilla stainless steel springs. The premium stainless steel material is built to keep your safety cover locked in during intense winds and heavy snow.