That is specifically a Rotary Hammer Drill Bit... It can be used for drilling holes in a floor, however the outside diameter of a 1" EMT conduit is 1 1/8" so I would not try drilling a 1" hole and getting it through!
You can get hundreds of holes with the proper bit using the proper drilling techniques... Tool abuse is the only thing that would drastically shorten its life... other than drillling into a live cicuit!
When you say CORE DRILL BIT, usually that refers to either a wet or dry coring bit with diamond tips and used by a specific coring machine.
We just bought a nice Milwaukee Coring machine that makes light work of going through concrete floors.
http://www.milwaukeetool.com/tools/...it-meter-box-and-diamond-coring-motor/4115-22
I don't know if this will show up as a link but you can copy and paste the above text to a browser window for the link to the Milwaukee Core Machine we bought. Home Depot had the best price on it.