Pipe reamers.
When you cutoff pipe with a pipe cutter, it leaves a huge burr on the inside of the pipe. These ream off that burr.
They are usually pretty dull when you find them like this. You can spend a lot of time with a small slipstone or a fine stone in a Dremel and bring them back. I have.
They are actually pretty fragile. People think they are big and tough and bang them around and toss them into the bottom of buckets of fittings
and then wonder why they are dull??
If you sharpen them, protect them.
yours Scott
