A type of jig that expedites repetitive hole center location on multiple interchangeable parts by acting as a template to guide the twist drill into the precise location of each intended hole center.

(US) The generic term for the principal instructor of fresh military recruits undergoing basic training in the various branches of the United States military, routinely abbreviated to the initialism DI; always filled by enlisted personnel (a sergeant or petty officer).

A rotating cutting tool, used for cutting holes in rigid materials, that consists of an essentially conical point, relieved and fluted to form cutting lips, and spiral flutes which direct the chips away from the lips and toward ejection from the hole.

plural of drill instructor

A twist drill. / Any other style of cutter, for example a spade drill, that is rotated and fed in a similar manner as a twist drill to of cut a hole in metal, wood or other materials.

plural of drill bit

plural of drill jig

plural of twist drill

A type of sea snail, Urosalpinx cinerea (and others in subfamily Ocenebrinae, such as genera Urosalpinx, Eupleura, and Ocenebra), that uses an eversible gland to soften its prey's shell, and then drill a hole in the shell to consume the oyster or other shellfish.

plural of oyster drill