The difference between Brad Point Wood drill and twist drill is that it has 3 tips on its head, which is easy to locate and will not run out of position, and when Cutting with high speeds, the swarf is in the form of powder, which is mainly used for processing small holes,but hex shank is more easy to be used on powder tools,it's easy to replace.

And use HSS material as below, it could be used to cut  wood ,plastic and sheet metal etc.