The Bosch HCFC2103 is a 5/8" x 10" x 12" SDS-plus Bulldog Xtreme Carbide Rotary Hammer Drill Bit. This bit has an outstanding lifetime in rebar. It's four-cutter full carbide head design delivers up to 4X life in concrete with rebar. It's four-cutter head also allows four cutting edges to hit rebar, preventing the bit from getting stuck. It is a genuine Bosch product.