Long Life Drilling Reinforced Concrete! Drilling through reinforced concrete is a tough job, and it has traditionally taken its toll on drill bits. Regular two-cutter bits get stuck in rebar and they eventually break. The Full Carbide Head on the EXPERT SDS plus-7X is an advanced 4-cutter design made from a single piece of the toughest metal: It doesn’t jam and presents no weakness on impact. For construction professionals drilling concrete and reinforced concrete regularly, for example for fixings and installations, the Bosch EXPERT SDS plus-7X Hammer Drill Bit offers peerless performance, reliability and longevity. It is THE EXPERT accessory for SDS plus rotary hammer drills.