Oztec Vibrator Heads produce the highest amplitude and centrifugal force, generating the largest radius of influence of any heads available. Energy is efficiently transferred from the motor, via the shaft, to the head, which is all eccentric (vibrating the entire head). Whether combined with one of Oztec's electric or gasoline powered motors and choice of flexible shafts...The results are exceptional!...Superior consolidation, increased productivity and a process more forgiving of less than perfect vibrating techniques. The benefits? Lower cost...Higher earnings...Superior quality concrete!