High Temp Masking Supply plugs keep powder coating, ceramic coating, paint, and more out of places you dont want them. Built to take the heat, they can withstand temperatures as hot as 600°F. This premium silicone rubber is flexible enough to conform to rough surfaces and works in both threaded and non-threaded holes. The tapered stopper design allows these plugs to fit many hole sizes and depths. Not just for metal finishing either, these versatile plugs can be used around the shop, home, classroom, etc. Color may vary slightly from photos.