Bosch Expert SDS plus-7X, Rotary hammer, Hammer drill bit, 0.787" (2 cm), 23.6" (600 mm), Concrete, Stone, 21.7" (55 cm) Bosch Expert SDS plus-7X. Proper use: Rotary hammer, Drill bit type: Hammer drill bit, Drill bit diameter: 0.787" (2 cm). Number of drill bits: 1 pc(s)