The Bentintoshape 48" x 20" Rectangular Fire Pit is constructed with 11 Gauge Cor-Ten Steel for maximum durability and rustic antique appearance. Cor-Ten, also known as Weathering Steel, is a steel alloy which was developed to eliminate the need for painting and form a stable rust-like appearance when exposed to the weather. The overall outside dimensions of the Fire Pit are 48” long x 20” deep x 20” tall. The fire bowl opening dimensions are 42” long x 18” deep x 4” tall. The gas burning option comes standard with a 75,000 BTU Burner and accommodates 90 lbs. of fire glass. Fire Glass sold separately. Options Available: - Wood Burning - the media grate is positioned 5” from the bottom of the fire bowl. (14" deep) - Natural Gas or Liquid Propane Gas burner kit - the media grate is positioned 5” from the bottom of the fire bowl and the fire ring is positioned below the grate. You would purchase this configuration if you are using ceramic logs or if you wanted to start a natural wood fire with gas. (14" deep) - Glass or Lava Rock burning with a gas kit - the media grate is positioned 4” from the top of the fire bowl and the fire ring is positioned above the grate. In this configuration, you would fill the bowl with fire glass or lava rock to just above the fire ring. The gas defuses thru the media grate and is ignited at the surface. (4" deep) Fire glass and/or lava rocks sold separately. - The Hidden Tank option comes complete with a glass/lava media grate and a propane gas kit for a 20 lb propane tank. On one tank, the fire pit will burner for approximately 8-14 hours. The overall dimensions of this Fire Pit are 48” long x 20” deep x 26” tall. Fire glass and/or lava rocks sold separately. Fire Bowl Cover constructed out of Cor-Ten Steel to convert your fire pit to a functional cocktail table when not in use.