Thanks for that - what about the 2nd from right on the top row? It's a bit different compared to the other spades?The first row are all varieties of spade bits, I think. The square end makes me think that they are for a bit and brace drill.
The long flat ones on the bottom might be for turning a straight hole into a tapered hole, like you might want for a chair leg. Counter-sink bits to the right of those.