I have a set of "spade" drill bits for wood that once belonged to someone's grandfather. The operation of this style of wood drill bit is sometimes jokingly re

I have a set of "spade" drill bits for wood that once belonged to someone's grandfather. The operation of this style of wood drill bit is sometimes jokingly referred to as "slapping chunks of wood off" until a hole appears, and I agree - for the ones sold now. Not these ones. They're noticeably sharper and truer than the ones you find now, more perfectly symmetrical in profile and grind, probably a half-dozen other subtle differences. When you drill a hole with one of these bits, all of the shavings are uniform and the sides of hole aren't ragged. There's less vibration, less heat, more progress.