These are Sako Optilocks with medium rings. In excellent condition... including the screws. They came on a used Sako 75 I purchased, and I have no use for them. (I prefer the old style Sako ringmounts).
Sorry, don't have the package or the 2 hex wrenches they come with. So you'll need 2.5mm and 4mm bits/wrenches.
$50 TYD in lower 48, The first "I'll take them", gets them.
Thanks..Rob