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search Drill scheme  A drill is a tool fitted with a cutting
tool attachment or driving tool attachment, usually a drill bit
or driver bit, used for boring holes in various materials or
fastening various materials together with the use of fasteners.
The attachment is gripped by a chuck at one end of the drill and
rotated while pressed against the target material. The tip, and
sometimes edges, of the cutting tool does the work of cutting
into the target material. This may be slicing off thin shavings
(twist drills or auger bits), grinding off small particles (oil
drilling), crushing and removing pieces of the workpiece (SDS
masonry drill), countersinking, counterboring, or other
operations.  Drills are commonly used in woodworking,
metalworking, construction and do-it-yourself projects.
Specially designed drills are also used in medicine, space
missions and other applications. Drills are available with a
wide variety of performance characteristics, suc