Width 1 1/2" 38mm in all sizes

8" x 1 1/2" 203 x 38mm
10" x 1 5/8" 254 x 41mm
12" x 1 3/4" 305 x 44mm
14" x 1 7/8" 356 x 48mm
16" x 2" 406 x 51mm
18" x 2 1/2" 457 x 64mm
20" x 2 1/2" 508 x 64mm