Where did you get it? I used to have, still do actually it is quite worn out, have a mini saw blade that is 12-15+ years old for my Dremal.
They have been outlawed now and are pretty much illeagle to get, atleast up here anyway, and you can't get them.
The hobby shops here won't touch them.
I used to see them all over the place, in different sizes even, up until about 6-7 years ago. Then they all of a sudden stopped being around and I never saw them again.
They have been daubbed "The Blade of Death"
I hold my breath everytime I use the darn thing now. 
Lynn