These are inexpensive 4" long, high-carbon steel bits ideal for green wood or dry softwood. They can be used for drilling tenon sockets in rustic furniture work or used in construction for drilling between joists and in other tight spots. Each bit comes in a plastic case, so will not get dulled rattling around in the bottom of a toolbox. On top of all this, they work well.
The single-flute style handles chips well and is a much stiffer bit than the double-flute style. The brad point makes it easier to control depth compared with a screw point. Available in 3/8" to 1" diameters in 1/8" increments. 2" of flute, 5/16" hex shank.