YouTuber, engineer, and woodworker Matthias Wandel showcases a square drill for round holes. It's a hand-operated drill designed for jigging things up.
Wandel says:
Krzysiek Brzeziński, from Poland, sent me his new product, a sort of square drill. Not for drilling square holes, but a square drill for round holes.
The idea of this drill is that with it's simple and sturdy rectangular housing, it can be slid along a guide for repeatably drilling holes in precise locations.
Wandel has built a screw advance box joint jig, a homemade power feeder using a roller skate wheel, created a unique machine that sets up dominoes in uniform rows, engineered contraptions to dampen the vibration on his table saw, and designed a remote control dust control switch. He also created a curtain rod that goes around corners, as well as a slinky escalator out of wood. Check them out here.

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