Bosch 2 608 831 011, Rotary hammer, Hammer drill bit, 0.256" (6.5 mm), 4.33" (110 mm), Concrete, Masonry, Stone, 1.97" (5 cm) Bosch 2 608 831 011. Proper use: Rotary hammer, Drill bit type: Hammer drill bit, Drill bit diameter: 0.256" (6.5 mm). Number of drill bits: 1 pc(s)