Rubber tool adapter Although this looks like a crevice tool, it's actually supposed to fit into different sized dust take-off points on sanding, edging and grinding attachments. It's made from soft, flexible black rubber. 

The Inside Diameter I/D of the large end is 56mm. I'll have to update the other dimensions next time we have one in stock. Andy

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!