Grower's Edge? High Stakes? Heavy Duty Round Tomato Cages are great for supporting tomatoes, climbing plants and top heavy foliar plants. These tomato cages are constructed of heavy-duty galvanized steel that will last for many seasons. Stackable for off-season storage. Wire thickness is 7 gauge (3/16 in) (0.1875 in). Each cage is designed with 4 rings and 4 supporting legs for added support and stability. Top ring diameter is 18 in.