Rocker arm is one of the major components vertical grinding machine, The rocker device is mainly composed of upper rocker, down rocker, rocker arm shaft, bearing, bearing seat etc. The upper rocker arm used to install the roller, the down rocker arm connects with hydraulic system. Two rocker arms are connected into a whole by shaft and taper sleeve and taper pin. Features of our rocker arm: 1. Duarable; 2. Excellent tensial strength; 3. Accure level of tolerance; 4. Good dimensional accuracy; 5. Superb surface finishing; 6. Easy to use and install.