Correct option is B
The
number drill series is a standardized series of drill sizes commonly used in machining and manufacturing. The sizes are denoted by numbers ranging from
#1 to #80, where
#1 is the largest and
#80 is the smallest. These sizes are defined in
inches, but they are commonly converted to millimeters for convenience.
For the number drill series:
The size of a
#1 drill bit is
5.719 mm (or 0.2280 inches), making it the
largest drill size in the number series.
Conversely, the smallest size,
#80, has a diameter of 0.343 mm (or 0.0135 inches).
