... variety of outer diameter to choose from 4.Replaceable reducer. MODEL:GMP361.36mm planetary gearbox2.Can allocate deceleration than3.A variety of ... to choose from4.plnaetary gear box,Can be equipped with dc motor, brushless motor, stepping motor5.Replaceable reducer or motor6. Reduction Ratio ... :981, 1:1370, 1:1913, 1:2671, 1:3730 36mm planetary gear reducer