Nilfisk GD930 formerly the Electrolux Euroclean UZ930 Panther commercial vacuum cleaner front wheel castor. This was fixed to the early Electrolux branded machines by a short 10mm threaded stud.

It's NOT for the current   Find that one as Pn. 

As it's light, maximise the saving on postage and buy some of the related parts below, such as and the or new hose Pn  or maybe a new floor tool.

At the moment, standard postage within Australia is capped at a maximum of $25!