Long Life Drilling Reinforced Concrete! Drilling through reinforced concrete is a tough job and it has traditionally taken its toll on hammer drill bits. Even 4-cutters wear out fast, resulting in downtime changing accessories and fetching supplies. The Full Carbide Head on the EXPERT SDS max-8X 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, such as for heavy-duty anchors or rebar extensions, the Bosch EXPERT SDS max-8X Hammer Drill Bit offers peerless performance, reliability and longevity. It is THE EXPERT accessory for SDS max rotary hammer drills.