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. ✔️ Contents: (25) brass anchor retainers, (25) brass screws and (25) brass collars. ✔️ Anchor Dimensions: Fits a 3/4" hole and are 1-5/8" long. ✔️ Collar Dimensions: Inside Diameter 9/16", Outside Diameter 1-1/2".