Looking for a security envelope compatible with quickbooks checks? this single window security tint confidential envelope is the perfect choice. Add your custom logo to be printed and no more handwriting information on your envelopes. This single window envelope keeps confidential information from showing and has a gummed flap that seals securly when moistened. 
Envelope size is  8 3/4 x 3 5/8 
Wndow size is 3 3/4 x 15/16
11/16 from bottom
3/4 from left