What is this notation for dimensions: 2-11/16" x 3-13/16"
The " in 2-11/16" denotes inches. The number of inches is written using a common notation for representing improper fractions using only ASCII characters. The represented fraction is



2-11/16" means "two inches and eleven-sixteenth", so the number of inches is actually 2+(11/16) = (2*16+11)/16 = 2.6875, or about 68.3 mm.

Similarly, 3-13/16" means 3.8125 inches, or about 96.8 mm.