Quality Park #8 Double Window Redi-Seal Envelopes, White, Box of 500 (24539)
Compatible with most standard 3-1/2 x 8-1/2 inch checks for payroll and accounts payable applications.  The top window (7/8" x 3-1/2") is positioned 5/8" from the left and 2-1/4" from the bottom of the envelope.  The bottom window (1"x 4"") is 5/8" from the left and 5/8" from the bottom.  Poly windows, inside tint.