...it is for a Diana 60T, but I know the an Anshutz will fit & I've been told that a Gehmann & a Centra will as well.
The Diana iris has an external thread diameter of 9.4 mm (on verynear!!) but I don't know what thread it is (not standard metric)
This is not for comps, just need a basic adjustable iris at a reasonable price.
Please let me know of any links you might see
Cheers Dave