Smooth running, low noise. Small Cubage, light weight, long working-life and high load-bearing ... %, three more than 90 %. 3.Smooth running, low noise. 4.Small Cubage, light weight, long working-life and high load-bearing ... .49/ 23.34/ 31.5 /40.17 /48.57 PM250-1000 series gear box, gear reducer