Bosch 2608680270 - 8 mm SDS Plus 1 Hammer Drill Bit has a working length of 100 mm and the total length of 160 m. It comes with the diameter of 8mm. Bosch 8 mm Hammer Drill Bit has an insert of tungsten carbide brazed into the steel. It is made to provide a precise cutting edge. Usually, the hammer drill bit is used with the hammer drill that hits the bit into the material that is drilled as it rotates.