Irwin 13 piece Auger set
Miller Falls Brace
Here is my Auger set and Brace. I use it when I want to bore nice smooth holes but don't want to set up a power tool.
I also use it a lot when I am making fixtures and I want to inset the head of a bolt below the surface.
I use two bits, one the size of the threaded part and another the size of the head to step the hole and set the head below the surface.