Anyone any idea what these are ?

[Dell]

I picked up another Pultra P type at the weekend to restore nice fairly complete and original along with it came a very complete box of collets & accessories but in the box are two items that were tied together that I have no idea what they are, I have been through the manual and can find nothing so probably not Pultra, one is slightly smaller than the other and the allen bolts push a slide, does anyone have any suggestions as to what they are ?
Dell
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[BillTodd]

They look like a box tool.

A tool for turn a fixed diameter on a long rod , by supporting the uncut material in a hole while a fixed (pre adjusted) tool in the slotted part takes the cut

[shipto]

Stab in the dark but possibly for turning square bar between centers? Big end in chuck small end on live center.