Splitting a single ply thread into two strands, allows space for materials
such as deer hair, hackle barbs, and dubbing to be placed between the
strands. Once the materials is inserted, spin the bobbin holder to
tighten the thread around the materials, then wrap it around the hook
shank.

Splitting a thread has usually been done with a very pointed
thin needle. The thread is flattened with the help of one’s finger nail,
and then the needle is pushed through the thread, of course if you can
hit it. And the thinner the thread, the harder it is to hit it.

With a SMHAEN thread splitter, this is no longer a problem. and it does
not matter if it is a thick or thin thread. The SMHAEN thread splitter
does both easily. a smooth edge and a small knob on the end of the
needle make it possible to split the thread. Flatten the thread on the
shaft of the needle. Slide the thread to the knob at the end of the
needle and allow the small edge to grip the individual fibers.
Pull back slightly to allow the fibers to separate, then push the round
knob through to split the thread into two strands.
The thread splitter handle is flat on one side to keep it from rolling off
the table.