Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. [tool and equipment components]
7. bits (tool components)

Anotations

Scope note:

Bits having a sharp spiral cutting edge which may be square, half-round, half-round and hollow, or five- to eight-sided and with tapered ends; used for enlarging existing holes or to remove burrs from the inside of pipes.