1 2 Inch Diamond Drill Bit

diamond drill
(Diamond drilling) Exploration diamond drilling is used in the mining industry to probe the contents of known ore deposits and potential sites.
(Diamond drilling) A method of obtaining a cylindrical core of rock by drilling with a diamond set or diamond impregnated bit.
(Diamond Drilling (DDH)) A common method of prospecting for mineral deposits, involves using a rotary type drill machine which is designed to recover rock samples in the form of cylindrical cores from rocks penetrated by boreholes

inch
A unit used to express other quantities, in particular
edge: advance slowly, as if by inches; "He edged towards the car"
A unit of linear measure equal to one twelfth of a foot (2.54 cm)
a unit of length equal to one twelfth of a foot
A very small amount or distance
column inch: a unit of measurement for advertising space

1 2
A 1-2 (pronounced "one, two") is a difficult gymnastics floor move. The name is derived from the fact that the move consists of a single twist followed by a double twist on both the horizontal and vertical axes.

bit
moment: an indefinitely short time; "wait just a moment"; "in a mo"; "it only takes a minute"; "in just a bit"
A unit of information expressed as either a 0 or 1 in binary notation
spot: a small piece or quantity of something; "a spot of tea"; "a bit of paper"; "a bit of lint"; "I gave him a bit of my mind"
a small fragment of something broken off from the whole; "a bit of rock caught him in the eye"