The following are suggested mat opening sizes for our standard mats. 
To order other mat sizes and openings than those listed below
please call us at 1-800-577-5920 
or request a Custom Quote.

Mat Size
Suggested Opening Size
Information
4x6"
2.5x4.5"
Fits 3x5 Picture
4x7"
2.5x5.5"
.75" Border
4x12"
2.5x10.5"
.75" Border
5x5"
3x3"
1" Border
5x7"
3x5"
Fits 3.5x5.5" or 4x6" Picture
7x7"
4.5x4.5"
1.25" Border
8x8"
5.5x5.5"
1.25" Border
8x10"
4.5x6.5"
Fits 5x" Picture
8.5x11"
6x8.5"
1.25" Border
8x12"
5.5x8.5"
Fits 6x9" Picture
9x12"
6.5x9.5"
1.25" Border
10x13"
7x10"
1.5" Border
10x20"
7x17"
1.5" Border
11x14"
7.5x9.5"
Fits 8x10" Picture
12x16"
8.5x11"
1.75" Border
14x18"
10x14"
2" Border
12x16"
8.5x11.5"
1.75" Border
14x18"
10x14"
2" Border
12x36"
8x32"
2" Border
16x20"
10.5x13.5"
Fits 11x14 Picture
18x24"
14x20"
2" Border Around Mat
20x24"
15.5x19.5"
2" Border Around Mat
20x28"
15.5x23.5"
2.25" Border Around Mat
22x28"
17x23"
2.5" Border Around Mat
20x30"
18.5x24.5"
2.5" Border Around Mat
24x30"
18.5x24.5"
2.75" Border Around Mat
24x36"
18.5x31.5"
2.75" Border Around Mat
27x39"
21.5x33.5"
2.75" Border Around Mat
27x40"
21.5x34.5"
2.75" Border Around Mat
32x40"
26.5x34.5"
2.75" Border Around Mat
>40"
>40"
We can not Manufacture this large