This vapor swing skillet features a titanium plate skillet. Heat it up and swing into action!When torching metal or glass to temps of up to 1500F, you want to be sure that the material is inert and safe.That is why we only offer Grade-2 Titanium products. You won't see these give out toxic fumes or burn black.The gong fitting(s) on this piece is 14.4mm.This item is hand made.We feel that it’s important that you the consumer knows where your glass comes from so you can make an informed decision. We are glass resellers not glass blowers so while we can’t say for sure who makes this item, we can say how it was made. We take the time to thoroughly vet our suppliers and make sure our goods are of high quality and standards.  While we won’t deceive you and say that these are "MADE IN USA", we can say that these are "well made and you will like what you see or your money back!"