Product Description Product Advantages Size R37 R57 R77 R87 R107 Ratio 3.41-134.82 4.39-782 5.31-1430 5.3-2873 6.66-7583 Power 0.12KW-3KW 0.12KW-7.5KW 0.12KW-11KW 0.12KW-18.5KW 0.12KW-18.5KW Output torque 30-205N.M 40-400N.M 50-795N.M 50-1610N.M 80-4870N.M Output...