Specifications: Materials: 304 Stainless Steel Thickness: 0.8 mm Diameter: 12" BTU: 92,000 Surface: Polish Fit for: gas/propane/NG fire pit. Package Include: 1 x 12 Inches fire pit burner ring 1 x 150K BTU air mixer valve & fittings 1 x wrench. (As shown in the main picture) Note: A general rule is to keep a 3" to 4" space between the burner and the sides of your fire bowl. Also, keep in mind that your gas or propane burner will produce a flame about 2" away from the burner, so an 18" burner is more like a 20" burner. .