NilfiskCFM industrial vacuum cleaner 50mm by 500mm adjustable aluminium wheeled floor nozzle WFN for vacuuming hard floor. These have rubber lips for sand and granular products and they are usually used with the  and the 

The clearance height of the lips can be adjusted by the knob on the top.

At the moment, standard postage is capped at a maximum of $25 within Australia, so maximise the saving on postage and buy something in the related parts below!