Netherton Foundry 13" (33cm) Spun iron oven safe wok lidShropshire Made 13(33cm) oven safe spun iron wok lid Made in Britain. The lid is pre seasoned with flax oil for a natural non stick finish. Pre seasoned with flax oil for a natural non stick finish. Durable 99. 1% pure spun iron wok lid with cast iron knob. This wok lid does not have a vent hole. Lids for woks: Please be aware that our woks are not always 100% round as they are hand formed. So, if you want a "sealed" style lid, this won't be for you.