This is a BRAND NEW  NORITSU QSS A035199-01 RACK MAIN DRIVE GEAR UNIT  w/A035160-01 GEAR for top of processor racks of Noritsu 29/31/32/34/37/38/39 processors. 

Come as a set of the following parts; 

A035199-01 Gear Unit x 1

A035160-01 Gear 33T x 1