What shell holders are these?

[William Yanda]

I won a lot of several shell holders, most I have identified. However, included were 4, cylinders the size of universal shell holders, 1/2 inch deep, with female threads. Anyone here ever encountered these before?
Bill

[LUBEDUDE]

Hard to say without a photo.

The Hollywood Junior uses a cylinder nut to secure the shell holder. But it is about 1.5-2 inches long, about 7/16 diameter(?).

[Artful]

Man, I remember presses that took male threaded shell holders
but not female threaded??

Looks like google found a match as
Vintage Echo Reloading Press Screw on Style Shellholder
https://www.picclickimg.com/d/w1600/pict/190722304298_/Vintage-Echo-Reloading-Press-Screw-on-Style-Shellholder.jpg
https://www.picclickimg.com/00/s/NzQ5WDk5OQ==/$T2eC16FHJF0E9nmFQUJ(BQRQ5fe,iQ~~/Vintage-Echo-Reloading-Press-Screw-on-Style-Shellholder-_57.jpg

Does it look like a match?

[LUBEDUDE]

I forgot about the Echo. Mine are buried right now.

I should have remembered because the Echo shell holders use a small special spanner type wrench to tighten them.

[William Yanda]

Artful
That's a match. The spanner note explains the 1/4 x 1/16 slot in the side of the cylinder opposite the opening for the shell in the top.
Thanks, my computer is refusing to recognize the USB ports, making posting pictures a major production.

[WarEagleEd]

When I saw the picture I thought "those are Echo shell holders." I have an Echo press that I use as my decapping station. I replaced the ram with a RCBS unit that accepts modem snap-on shell holders, but kept the original ram, spanner, and, I think, the few shell folders that came with it when I bought it.

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