Bosch is the home of the world's best selling hammers. Bosch hammers have reduced vibration without any reduction in performance. The Bosch RH328VC SDS-plus rotary hammer features vibration control without sacrificing performance. Vibration levels are reduced in a two step process beginning with the point of origin, the impact mechanism. Vibration is further reduced at the point of effect, the handle, with rubber dampening elements at the top and bottom of the main handle providing maximum user comfort.