Hi Whimbeader,
I assume you mean crimp beads/tubes size 1x1 mm. (1mm. long x 1mm. wide) when you said #1 crimp tubes.
This particular size of crimp bead cannot be used to finish off the ends of necklace or bracelet because it is TOO small (you need at least 2mm.x1mm. or 2x2mm. which is a standard size for most jewelry). However, you can use this 1x1mm.as stopper when you make necklace that needs spacing and expose the wire.
You may also have to give a bit more information, it will help a lot more to understand.
Hope this helps.
Jack.