Made from high?grade cast iron for lasting strength and heat retention. The 9.37?inch outer diameter fits most standard gas burners, providing a stable base for round?bottom woks during high?heat cooking. Precision-engineered 0.36?inch (9.15mm) grooves on the bottom lock securely onto your stove grate. This anti?slip design prevents wobbling, tilting, or sliding, so you can stir?fry with confidence and no accidental spills