The name René Gerber AG stands not only for the world's best brushing, polishing- and honing machines, but also for the phenomenal thickness grading apparatuses. These machines have been developed to simplify work processes in an amazingly simple way. The user has four types of apparatuses at his disposal for sorting a wide variety of small parts according the diameter on the thickness of the parts made of various materials: the DS 120, DS 200, DS 300 and DS 450.