Typical drill bits have markings somewhere on the shank above the threads. It's small, but it usually has the drill-bit diameter stamped into the metal; the number is written in fractions. For example, the markings may read: 1/4-inch, 3/6-inch or 25/32.
What is equivalent to a 1/8 drill bit?
Drill size Diameter (in) Diameter (mm)
---------- ------------- -------------
7/64 in 0.1094 2.7781
1/8 in 0.1250 3.1750
9/64 in 0.1406 3.5719
5/32 in 0.1563 3.9688
When drilling a hole for a screw what size drill bit do you use?
If you are creating a pilot hole for a nail, the right drill bit is slightly smaller than the nail's shank. If you are creating a pilot hole for a screw, the drill bit should be the same size as the body of the screw—not including the threads.7 nov 2018
What do drill bit numbers mean?
Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest). Although the ASME B94. 11M twist drill standard, for example, lists sizes as small as size 97, sizes smaller than 80 are rarely encountered in practice.