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Yes, they are generally based on Reuleaux triangle shape, which is mounted eccentrically so points on its contour track a square shape when rotated.


Another way to "drill" a square hole is with a mortising bit. A mortising bit is composed of a regular round drill bit inscribed within a hollowed square chisel. Most of the material is removed by the drill bit while the corners are squared-off by the chisel.
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15y ago

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