Question

what are the three special marks on a folding rule?
12\
16\
18.6\
19.2\
24\
32\

Explanation:

In construction and wood - working, common special marks on a folding rule are 12" (a foot for basic linear measurement), 16" (used for spacing in framing, like studs), and 24" (another common measurement increment in building).

Answer:

12", 16", 24"