This is a rod-holding block for your smaller flameworking / lampworking prep and rods. There are two versions, one for 5-7-9 mm rods, another with holes for 5-9-12 mm rods.
Even larger versions also available in my profile.
Has two pocket screw holes in the back for attaching to a heavy piece of wood for stability, or direct to your bench. In my experience it is not needed, but it's there if you want.
The author marked this model as their own original creation.