D bit cutter

{{Short description|Specialty cutting tool}}{{More citations needed|date=October 2023}}

A D bit cutter is a specialty bit in the shape of a "D" when looking from above. Often used to make precision holes using a lathe.

This type of drill was first used in the early manufacture of muskets and other artifacts requiring a long straight holes in the days before modern accurate machines were available."[https://web.archive.org/web/19991009134737/http://www.geocities.com/Paris/5701/smallpipes/tools.htm WebCite query result]