1 x Bosch EXPERT SDS Max-8X Hammer Drill Bit 18 x 540mm Bosch EXPERT SDS Max-8X Hammer Drill Bit is ideal for construction professionals drilling concrete and reinforced concrete regularly, such as for heavy-duty anchors or rebar extensions. The full carbide head features an advanced 4-cutter design made from a single piece of the toughest metal: It doesn’t jam and presents no weakness on impact.