Onlyfire 18 Inch Stainless Steel Round Double Fire Pit Burner Ring, SS #304 18" double Stainless Steel Fire Pit Burner Ring, 147,000 BTU Max. 100% 304 stainless steel; Dimensions: dia 18" 1/2 inch Inlet which includes inlet plug and wrench Fuel distribution ports are precision drilled for quality New cross-bar design for better gas distribution;Concentric rings increase in diameter for better flame height