Invaluable! We suggest you always use one of these when you're making threaded bead items. It creates a stopper at the end of your thread so that the beads you've already threaded don't fall off the end.
It is easy to use, clamp on and off one end of your thread, nylon filament, elastic or coated wire. You can clamp on a few threads at a time if you want.
Pack of 2