The lateral tabs prevent the index dividers from sliding forward and allow the index dividers to ride up or down in the vertival slots as {HEAD ~ the stack} of {TAIL ~ sandpaper sheets} changes 
of
The lateral tabs prevent the index dividers from sliding forward and allow the index dividers to ride up or down in the vertival slots as { HEAD ~ the stack } of { TAIL ~ sandpaper sheets } changes
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH