Needle sharpener: for fiber or steel needles?

[amrcg]

Hello

I've found this item in eBay:
http://www.ebay.co.uk/itm/120914214828? ... 500wt_1345

The stylus does not seem to be shaped as a triangle. So my question is: which kind of needle is to be sharpened with this piece of equipment?

Cheers,
António

[kirtley2012]

that is for sharpening im pointmaster needles which are wooden burmese thorn needles they look the same shape as steel needles but are wooden, steel needles cannot be sharpened and fibre needles are sharpened by a needle cutter which usually looks like a pair of scissors
here is a picture of some IM pointmaster needles