On Apr 20, 2025, at 12:08?PM, Jacob Coby via groups.io <jacob.coby@...> wrote:

I’ve had these machine tool parts for about 10 years now. I got them from a machinist that went to a nursing home and never got to ask him what they were. They’re marked with common thread sizes but the actual pitch is half of what they are labeled as. All I can think is they’re for a screw cutting operation on a lathe that doesn’t have screw gears? There are no makers marks on the parts or the box other than the latch says Prestolock Co.? They seem to be very well made.?

<Image_250420_120627.jpeg>