15 X 15 inch, Mounts, Backs, & Bags, Pack of 10 Aperture size:To fit image size 11 x 11 - exact aperture size 272mm x 272mm This means that the 3

This means that the 3 inch excess will need to be folded down at the back of the mount

then sealed with the self-adhesive flap in the normal way

Outer Size to fit a 20 x 16 inch frame - exact outer size 505mm x 404mm

Outer Size to fit a 5 x 5 inch frame - exact outer size 124mm x 124mm

15 X 15 inch, Mounts, Backs, & Bags, Pack of 10 Aperture size:To fit image size 11 x 11 - exact aperture size 272mm x 272mm This means that the 3Outer Size to fit a 15 x 15 inch frame exact outer size 378mm x 378mm The cellophane bags supplied with this size will be 16 x 16 inches. This means that the 1 inch excess in width will need to be folded to the back of the mount and held in place using clear self adhesive tape. Then the excess length can folded down and sealed with the self adhesive flap in the normal way. Choice of aperture size Scroll through the pictures to find the size that best