This is the Hollow Rotary Reducer model number GSN200-18K-CS with table size 200mm gear ratio 1:18 and closed loop stepper motor. GIGAGER Hollow Rotary Actuator combines the advantages of the servo motor, cam indexer and DD motor, obtaining a balance between these three products. It can make segments at any angle with servo motor or stepping motor, which can meet the digit control that the cam indexer cannot achieve.