A method for manufacturing drill bits in segments, using a single key which is nowhere concave in its axial profile to position all three segments together for welding; and drill bits so made. The Mo\u2014W material for wirings is a product obtained by compounding and integrating a Mo material and a W material as by the powder metallurgy technique or the smelting technique or a product obtained by arranging these materials in amounts calculated to account for the percentage composition mentioned above. A user’s metadata can, in some instances, provided across a wide variety of computing devices on which the user may experience the media content, thus standardizing the user’s personalized media experience.