These are Bosch titanium drill bits and are probably one of the top 1-2 drill bits in the home market (and possibly commercial). With proper use, these drills should provide years of reliable service.
Pros
Drills clean, accurate holes in materials as little as 1/8 inch thick, sheet metal, pipe, steel, copper, brass, aluminum, plastic, Plexiglas, wood, veneer, vinyl siding, drywall, PVC, stainless steel and cast iron