Rotary tables GN 900.6 is a turning unit for manual operation. To get the turning movement we use a high quality worm gear. The rotary table is also fitted with a fastadjustment and for this purpose a grub screw on the side of the rotary disc has to be released. In addition the rotary disc can also be clamped via an easily accessible grub screw. In both cases internal conically shaped arresting components come into use.