The first-stage transmission adopts the worm gear and worm. It has a large ratio(total ratio can be up to 4000).Compared with the NMRV series, the UWG series has a higher ratio, output torque, and efficiency. The external dimensions are almost the same as the NMRV series.The installation method is similar to the NMRV series.There is no difference in the diameter of the hollow output shaft compared to the standard NMRV series reducer.It can use all of the accessories from NMRV series.