Metal Tree Surround and Watering Ring Kit provides a durable, all-metal border to define the planting area and give trees room to grow. The kit includes a metal Tree Surround border that raises the tree and helps you control the soil around it, protecting roots from moisture loss, flooding, and damage from lawn equipment and weed whackers. The set features a heavy-duty 16-gallon slow-release Tree Watering Ring that fits around the trunk in a doughnut shape and can be placed under or over mulch for steady moisture delivery. Built for longevity, these components use treated steel with stainless steel hardware and USDA-approved protective coating, delivering a 20+ year lifespan. Tree Surrounds measure 36 inches wide by 8 inches tall, and Tree Watering Rings measure 36 inches wide with a 16-gallon capacity, providing 12 hours of slow-drip irrigation. All of our tree ring surrounds, garden beds and planters are a great investment compared to wood. π Product summary: Includes all-metal Tree Surround border and a 16-gallon slow-release Water Ring. Doughnut-shaped Water Ring fits around the trunk and nests in the kit. Surrounds: 36" W x 8" H; Water Ring: 36" W, 16 gal. Watering rings provide 12 hours of slow-drip irrigation. Can be placed under or over mulch; UV-resistant watering bags. All-metal construction with treated steel, stainless hardware, USDA coating; 20+ year lifespan. Durable alternative to wood; part of a line including garden beds and planters.