This sale is for a very good condition Mamiya 7 80mm f4 Lens Hood, suitable for use only with the Mamiya 7 / 7ii 80mm f4 lens.
The mounting ring on this hood is slightly damaged but the hood is otherwise near mint. It still mounts on the lens without any problems, but is obviously not perfect so is being sold at a bargain price.
This is the proper bayonet-fit Mamiya lens hood, not a cheap screw-in clone. Try finding another one – these are almost impossible to find.