All spindles are fitted with high precision ball bearings. The number, the size and the location of the bearings as well as the strength of the inner spindle are selected to provide the optimum rigidity. The wall thicknesses of the spindle housings are overdimensioned and together with high rigidity have a noise and vibration damping effect. The grease lubricated bass bearing sections are in addition protected by seals at eighter side. Belt Driven Spindle provides unparalleled smooth running. Suitable for Internal Grinding Machines use.