Jobber-length Drill
Jobber-length drills are the most common type of drill. The length of the flutes is between nine and fourteen times the diameter of the drill, depending on the Drill size. So a 1⁄2 in (12.7 mm) diameter drill will be able to drill a hole 4-1/2" deep since it is nine times the diameter in length. A 1/8 Dia Drill can drill a hole 1-5/8" Deep since it is made thirteen times the diameter in flute length
Read more about this topic: Drill Bit Sizes
Famous quotes containing the word drill:
“Swift blazing flag of the regiment,
Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
Make plain to them the excellence of killing
And a field where a thousand corpses lie.”
—Stephen Crane (1871–1900)