![Twist drills with interchangeable inserts and drill heads Illustration of Twist drills with interchangeable inserts and drill heads](https://www.manufacturingguide.com/sites/default/files/styles/lexicon_word_image/public/technical-term-images/straightdrillinsert_0.png?itok=SYYmEOGq)
A variation of the twist drill in which the cutting parts are interchangeable
By using interchangeable inserts or the entire top of the drill, also called a head, instead of sharpening a worn drill, you can replace these parts instead.
In these cases, the inserts are usually made of cemented carbide.