A 10 cm hole is almost 4 inches ! ! - IF you meant 10mm, then that's a little over 3/8 of an inch, or 13/32 for a clearance hole.
The thinnest drill bit available for purchase is typically around 0.0135 inches in diameter, also known as a 80 drill bit.
For all practical purposes an 8mm drill is equal to 5/16 inch.
The recommended 5 drill bit size for drilling holes in metal is 0.2055 inches in diameter.
12mm
There are 25.4 millimetres in one inch. Therefore, rounded to two decimal places, 8 millimetres is equal to 8 / 25.4 = 0.31 inches.
Drill bits not only come in fractional number sizes they also come in letter sizes. The F size drill bit is .257 thousandths of an inch in diameter. A 1/4 inch drill bit is .250 thousandths of an inch in diameter, so size F is .007 thousandths of an inch bigger than a 1/4 inch drill bit.
.50196850"
.0995"
Depends on the diameter of the conduit. Try for 1/4" larger diameter drill bit.
if the diameter 5/16 inches then you covert the 5/16 into 0.3125 inches. divide 5 by 16=0.3125 which is a little bigger than 0.3! ;)
A # 30 drill bit is 0.1285 inch, or fractionally more than a 1/8 bit.
The standard size of a 6mm drill bit is 6 millimeters in diameter.