yes John, I have been using them for the same purpose and still finding more uses.
I have just inlayed Pau abalone 3mm wide and the file was perfect for cleaning out the channel.
I got a couple of different sizes from the chinese ebayers for around $2 inc postage , I thought they would last 2minutes but they seem to be fine

great price for a tight A$$ like me.
but yes a very useful tool.