PLS series inline speed increasing gearbox, with a maximum size frame size of 160 mm, can provide excellent power transmission performance for motion control applications currently on the market using servo motors or stepper motors as power sources. After matching with the motor, it can be directly installed and used. The design of single to three sections provides a reduction ratio of up to 1000:1, and the optimal backlash is less than 8 arcmin. The connecting plate is suitable for all servo and stepper motors.