Multiple Sortables without Classes?

Multiple Sortables without Classes?

Is there a way to do more than two sortables that can be dropped on each other without using a common class between them? For example:
 
<div id="Col1">
  <div id="Num1">One</div>
  <div id="Num2>Two</div>
</div>
 
<div id="Col2">
  <div id="Num3">Three</div>
  <div id="Num4>Four</div>
</div>
 
<div id="Col3">
  <div id="Num5">Five</div>
  <div id="Num6">Six</div>
</div>
 
How do I make all three columns into sortables that I can drag between without connecting the same class to each of "Col1", "Col2" and "Col3" : because I want to give each of these columns a different "look" by css class.
 
TIA,
Owen