This is a bit for drilling square holes in wood. It’s just an ordinary round bit with a square chisel around it. Drilling a square hole in metal is also possible, but requires a more complicated tool that is beyond the scope of this website (that’s code for I don’t know how they work).
Location: Box 30
Have you used this tool? Think my description is all wrong? Have a better example? Comment now with any thoughts you have about this tool!