If you follow the references it is explained fully Mark in the Video. I have been using Artu Drills same claims and for my purpose drilling brick and concrete to hold Loxins or similar holding methods. You do not need a hammer drill.Perfect through bathroom tiles. The price is right,that lubricant is not cheap nor the Diamond file thrown in.Replacements are available from him.
The so called Armour Piercing is a Sales gimmick but they romp through tough steels like Files,Bearings,Broken Taps etc.
Peter.