High Temp Masking Supply caps keep powder coating, ceramic coating, paint, and more off of places you don't want them.  Built to take the heat, they can withstand temperatures as hot as 600°F.  This premium silicone is flexible enough to conform to rough surfaces and works on both threaded and non-threaded parts.  Not just for metal finishing either, these versatile caps can be used around the shop, home, classroom, etc. Color may vary slightly from photos.