A vibrator with a deep portable drive: what kind of tool is this

In the construction and when making reinforced concrete products and concrete products, a special vibrator with a deep portable drive is used. Vibrators with a portable drive are used even in eliminating the seams of technical and in prefabricated structures. In the drive of the vibration infertage, which has a vibration mechanism, use an electric drive having one phase. Flexible power shaft is necessary so that the rotation of the electric drive could be transmitted to the vibration endoent.