No. 10 1/2 envelopes are designed for use with Insurance Form CMS-1500 and similar forms. The 1" x 4-1/2" window positioned 4-1/4" from the left and 19/16" from the bottom of the envelope. Inside security tint offers more privacy. 24 lb.
                                                                             
                                    
                                        
                                                                                               General Information 
  Manufacturer:  Quality Park Products
  Manufacturer Part Number:  21432
  Manufacturer Website Address:  http://www.qualitypark.com
  Product Name:  HCFA-1500 Claim Form Envelopes
  Packaged Quantity:  500 / Box
     Product Information 
  Mailer/Envelope Type:  Single Window
  Mailer/Envelope Classification:  #10 1/2
  Mailer/Envelope Width:  4.50"
  Mailer/Envelope Length:  9.50"
  Mailer/Envelope Weight:  24 lb
  Closure Type:  Gummed
  Seam:  Contemporary
  Window Location:  Right
  Window Height:  4.50"
  Window Width:  1"
  Features:  Self-adhesive,Security Tint
     Physical Characteristics 
  Color:  White
  Material:  Wove