![Reamers for larger diameters Illustration of Reamers for larger diameters](https://www.manufacturingguide.com/sites/default/files/styles/lexicon_word_image/public/technical-term-images/xlargereamer.png?itok=MMASdtPq)
Reamers used to widen larger diameter holes while improving its roundness.
Reamers for larger diameters is generally constructed of a tool holder in which a set of inserts are mounted. These widen and increase the hole tolerances for a previously drilled hole that is slightly narrower than the desired tolerance.