The Cardinal CS600OPT is a 1 Pc. Turnbuckle A-Frame. Cardinal utilizes 14-gauge galvanized or ZAM corrosion-resistant steel for all inground pool builds for durability and strength that will last the lifetime of your home. Whether choosing from one of our standard pool shapes or designing a custom shape unique to your landscape, all pool parts are manufactured to exact size specifications making a Cardinal pool the ideal choice, every time.