Bosch Rotary Hammer, 120 V, 3/4 in Chuck, Keyless, SDS-Plus Chuck, Blue. Bosch is the home of the world’s top selling hammers. Bosch hammers have reduced vibration without any reduction in performance. The rotary hammer, works harder, lasts longer and vibrates less. It has the fastest chiseling and drilling in its class. In. addition, it provides the longest life, with lowest vibration levels.