The listing, Scope Mounting Rings has ended.
Black aluminum rings to be used to mount a scope to an air rifle or small caliber rifle (like a .22LR, for example) if your rifle does not have mounting rail. I do not know the make or size of the rings. A gunsmith took then off a scope when I moved it from one rifle to another. One is complete with two screws but the other only has one screw ( the other fell off or was otherwise lost.