Drill bit sizes are

written as irreducible fractions

. So, instead of 78/64 inch, or

1 14/64 inch, the size is noted

as 1 7/32 inch. Below is a cart

providing the decimal-fraction

equivalents that are most relevant

to fractional-inch drill bit sizes

(that is, 0 to 1 by 64ths). (Decimal places for .

If you know the size of the screw,

you can locate the size of the

drill bit by looking at the opposite

end from the sharp point of the bit.

It's likely engraved there.

Standard metric sizes are

defined in ISO 2936:2014

"Assembly tools for screws and nuts

—Hexagon socket screw keys", also

known as DIN 911. The full set of

defined sizes are: 0.7 mm, 0.9 mm,

1.3 mm. 1.5 to 5 mm in 0.5 mm increments.

They're great for being able to

be quickly swapped out if you

an adapter, and even without an

adapter that hex shank is a lot easier

for your drill chuck to grab onto when

using very small bits like 1/16”

& smaller.

You'll see a list of numbers from

to 10 or 20. These are used to

set the clutch to deliver a torque range.

The higher the number on the collar,

the higher the torque and the larger the

fastener that can be driven.

To adjust your clutch, align the

arrow to a lower setting and start

driving a screw.

Take a loose screw and

compare it to the size of

the bit you need to use,

using the screw's core rather

than its flute. A bit that is very

slightly smaller than the screw

will ensure a proper fit. Choosing

a bit that is too small means that

the screw will get stuck so take care

to choose carefully.

In hex, four digits of a binary

number can be represented by

a single hex digit. Dividing a

binary number into 4-bit sets

means that each set can have

a possible value of between 0000

and 1111, allowing 16 number

combinations from 0 to 15. With

the base value as 16, the maximum

value of a digit is 15.