VMT are manufacturing MT-4, MT-5, high Speed Revolving Center. Revolving Center are typically used for supporting long work piece rotating at high speed. They are mounted on the tail stock & prevent the work piece for leaning due to its weight or deflecting due to cutting force action upon its constructed. So that 60 center run in its on bearing & used in a machines non driven or tail stock. For more info visit us: https://www.vishalmachinetools.com/revolving-center.html