If you've ever smoked a pipe without a screen, then you probably have experienced dottle, the nasty clump of wet tobacco at the bottom of the pipe, and if left untreated, it can give a permanent foul taste to your pipe.

Pipe screens go at the bottom of the pipe bowl, and prevents dottle from forming, and prevents tobacco from accidentally being sucked up.

These thick brass pipe screens are 0.812 inches in diameter.