Constructed from 3/16"-thick steel with cut-out vents on the bottom of the ring to increase air flow. ADA compliant at 18"-height with triangular feet to keep the ring in place in the soil. Includes a 1/4"-thick removable steel plate that allows for easy clean up. This ring's triple wall construction reduces outer ring to an ambient temperature. Powder coated at 500 degrees for long-lasting, beautiful exterior finish.