Hi Judy,
The smallest I sell is the 2/0.
I don't think you can find a smaller on.
This might be of some help:
All spiral blades are made from regular flat blades. After the teeth are milled in the blade, the blade is heated and then twisted
and then it goes through an oil bath to get the hardness.
If your read "How Blades are Made" might help somewhat.
Spirals with reverse teeth are made from regular blades with reverse teeth. The blades with flat ends are flattened after they are heated.
The new spiral is also made from a regular blade, however after the teeth are milled, the roll is reversed and then there are teeth put in the back side
of the blade. This makes them a lot easier to control, the others have a mind of their own and like to cut into the soft spots of the wood.
Spiral blade are use when the wood is too big for the saw and they really like them to cut portraits and wild animals and wild live.
FD Mike