Bias Tape/Binding Makers

[Charliepw]

Hello
I've seen these bias tape maker gadgets and they look quite good so i was thinking of getting one, but i wondered if anyone could help.

They come in different sizes and i wondered if the size relates to the tape unfolded or folded and finished.

IE: i would like to buy one that makes tape when finished to be about 10-12mm ie: folded and ready to sew it should measure 10-12mm, if i open the fold out to insert the material, it should be 20-24mm.

There is one here.

Sorry to sound like a dufus but do you think this is this the one i want?

[PuzzleRocks]

Bumping for you.