Looking for a security envelope designed for checks, this single window security tint envelope is the perfect choice. It keeps confidential information from showing and has a gummed flap that seals securly when moistened Envelope size 8 7/8 x 3 7/8 Window size 4 1/2 x 1 1/8 Window placement 3/4 inch from bottom. IF YOU ARE USING QUICKBOOKS SOFTWARE PLEASE USE ENVELOPE ITEM # DF91662