Poolzilla safety pool cover hardware is designed to have a universal fit and works with all major brands of swimming pool safety covers. All of our pool cover accessories are built to be durable and keep your swimming pool area safe throughout the off season. Poolzilla brass are an essential piece for pool closing season. High end brass ensures your pool cover will stay locked in place and can endure harsh weather conditions. ? Contents: 25 Screws ? Spring Dimensions: Thread Size: 9/16inch, Length: 1-1/8inchv? Screw Material: Brass