... step: about 17 stepsRoller material: Cr12, quenching HRC58-62, with hard chrome on the surface, with high wearing resistance.Voltage: 380V/50HZ ... step: about 17 stepsRoller material: Cr12, quenching HRC58-62, with hard chrome on the surface, with high wearing resistance.Voltage: 380V/50HZ ...