When you drill into concrete it's sometimes easier to first drill a hole with a smaller bit. Get the Drilling Into Concrete Tools guide: http://www.familyhandyman.com/tools/drills/drilling-into-concrete-tools-rotary-hammers-and-hammer-drills/view-all
The Bosch 1 in. x 31 in. x 36 in. SDS Max Carbide Rotary Hammer Drill Bit features centric tip guides bit through hard and reinforced concrete. It includes angled dust channels to reduce heat build up. It is ANSI certified product for safety.