This is a handy pack of 30 solid brass replacement gas jet nozzles (also called burner tips or heads). They are commonly used for wok ranges, commercial burners, or other gas appliances. Each nozzle is about 36mm tall and 12mm in diameter, with a 7mm outer diameter thread. They have a small air hole (approx. 8mm) as part of their design. Made from durable brass, they're a cost-effective way to repair or maintain your gas equipment. Important: These are for liquefied gas (like propane) systems only. Always make sure to match the size and thread of your old nozzle before purchasing, and for safety, consider having a professional handle the replacement if you're not confident.