• nickwitha_k (he/him)@lemmy.sdf.org
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    7 months ago

    They do indeed really cut square holes. They’re called mortising bits. Like the other commentor stated, they’re basically a combination of a chisel and a drill. The drill does most of the work in waste removal while the square blades give you 90° corners.

    One could also potentially consider a rotary broach to be a “square drill” (supposing that it is a square and not a hex or other shape).