Invoice Template

Invoice Template

Hi
 
I have edited the default inventory invoice template to suite my needs. In the main section i have Product Name, Qty, List Price and Total. Under Product Name, I have included its description which is rather long for some products.
 
When i create an invoice and export to pdf the description column, if long extends automatically and all other column sizes reduces. Is there anyway i can restrict the width of the product column?
 
Regards
Srinivas