We have several patented designs that allow for the assembly of a wheel chart without the use of a center eyelet or grommet. The advantages include:

 There is nothing to interfere with the graphics 

 There is no danger of a metal eyelet making marks
  on the adjacent pieces while they are packed in
  boxes or envelopes.

 They allow for the inexpensive and fast production
  of large quantities of wheels. No longer are we
  limited by the number of eyeletting machines in
  our plant.