These finely crafted measuring devices are
used for gaging V,
American National or
U.S. standard 60°threads.
Gages are notched for measuring inside
threads of small holes
and nuts as well as
external threads.
Set of 51 screw pitches combines all sizes
from 4 to 84,
including 11-1/2 and 27 pipe
thread sizes.
Knurled thumb nuts lock the case in an open
or closed position.