This typeband sawing machine: Apply in cutting stainless steel, ferrous, metallic & non-metallic materials. Hydralic fasten,stepless feedingspeed control,and saw blade speed has 3steps(26,46,72m/min) These features help to realize efficient cutting through different speed and choose suitable blade. Example: cutting 45# carbon steel,dia 100mm . this band sawing machine G4230/50S2usesaw speed 46m/min, cutting rate isabout60-70 square cm/min, so it need less than 5 minutes. If we use 72 m/min, we need less time. But if you want to make the cut most efficient,you should choose the most suitable blade type,cutting speed,and feeding speed according to your material type,size and shape and so on, that is why we always ask you the material information. More information pls contact with me.