Bosch plus-8X, Rotary hammer, Hammer drill bit, 0.63" (1.6 cm), 21.7" (550 mm), Concrete, 15.7" (40 cm) Bosch plus-8X. Proper use: Rotary hammer, Drill bit type: Hammer drill bit, Drill bit diameter: 0.63" (1.6 cm). Number of drill bits: 1 pc(s)