Normal drills with two cutting edges get stuck in the reinforcement and break off. The full carbide head on the Expert SDS plus-7X is an advanced 4-cutter made from a single piece of the hardest metal: it doesn't jam and shows no weakness when impact drilling. Thanks to Bosch Carbide Technology and the full carbide head, the Expert SDS plus-7X lasts far longer than normal hammer drills. It effectively penetrates reinforcement so you don't have to stop, re-aim, or change drill bits when you hit steel. For construction professionals who regularly drill into concrete and reinforced concrete, such as for drilling and installation. The Bosch Expert SDS plus-7X hammer drill bit offers unparalleled performance, reliability and durability. It is THE expert accessory for SDS plus hammer drills. Suitable for all SDS plus hammer drills.