Output torque T2N :12 Nm - 3,200 NmRatios: 1-stage :1 / 1.5 / 2 / 3 / 4 / 5Low backlash 1-stage :≤6 arcminHigh efficiency 1-stage : ≧ 98%Easy mountLow noiseCompact structure Material: Cast Iron with black oxidizing.