This is the 50mm internal diameter hose only, from rubber cuff to rubber cuff.
It's used in the standard 50mm industrial tool kit for all the CFM machines.
Sometimes it's grey,sometimes green, or in this case transparent with a green spiral. This spiral has a clockwise attitude, whereas most hoses fitted to vacuum cleaners have an ANTICLOCKWISE spiral. The black rubber antistatic cuffs fit it. The lower cost grey PVC cuffs don't.
At the moment standard postage within Australia, is capped at a maximum of $20! So, maximise the saving on postage and buy some of the related parts below, such as dustbags and the filters or other accessories.