... the middle axis is 45# steel.2. About the helical blade of the auger, Continous cold rolled once ,without welding.3 ... customers requests.4.Our company have 2 sets of helical blade rolling mill specialized facilty and 1 set of vertical cutting ... machine, snowplough , snow blower,and the snow sweeper.our spiral blade features1.smooth finished surface,uniform shape,high precision 2.good ...