Specially developed for the watch industry, polishing holder with ball bearing and M16 thread tap. By fitting up tensioning attachments or clamping jaws, housings, steady rests or housing bottoms can be polished, frosted or ground easily. Workpieces are clamped precisely and centrally by means of the cone and can be held without heat transfer. The polishing holder rotates at the same speed as it comes into contact with the polishing or grinding attachment.