OzFclass

The slot is offset, could be inside case deburrer.
If so, what brand tool do they fit?

I never thought they were intended to fit any tool but to be used hand held. They do work OK hand held both inside and outside but are not as good as the other fluted type deburrer.

I have one from when I started reloading. Pretty certain they are Lyman brand. They don't fit any tool. They are a chamfer and deburr tool used in your finger tips, hence the knurling. Only takes about 3 cases before your knuckles are locked up solid and you cant feel your finger tips anymore.

Lee chamfer/deburrer they do work somewhat, I have one, I also have a Wilson, I don’t use the Lee

chamfer & deburing tool that come with every press kit made by Lee Precision.
heres an extra tip/use for them too.. they also work well to clean up a damaged thread on nuts and bolts if you"ve dropped them on concrete or similar .

As Rich4 said,Lee hand held chamfer tool.

They work well in conjunction with the Lee case trim tool that provides a case holder that fits in a cordless drill. Trim the cases to length and then use the chamfer tool to quickly trim the inside and outside of the case mouth.

Rich4 wrote:Lee chamfer/deburrer they do work somewhat, I have one, I also have a Wilson, I don’t use the Lee

You are correct, not one of Lee's better tools.
Keith H.

Many tks for all the replies, I'Ii try them on some 1/4" UNF SHCS

One of my early acquisitions was a Hornady reloading 'kit' although I did have a good old Aussie press. I am fairly sure one of these came in the kit.

Peter Smith.