Container clamp for the Nilfisk-ALTO and the and the wet and dry vacuum cleaners.
There are one each side of the motor head, and they clamp the head to the dust container. They have been slightly modified several times over the last 15 years.
You are buying a single clamp.
At the moment standard postage within Australia, is capped at a maximum of $25, so maximise the saving on postage and buy something in related items below!