Even though this is a small grain mill, it’s very well made with high quality stainless steel throughout. It’s slightly magnetic, but should never have corrosion issues. It would be very easy to attach a plastic funnel to the hopper, to increase the capacity. I would say it’s good for smaller batches of grain, due to the size, but it makes very fine cornmeal. I’ve noticed no metal on metal contact, but you’ll want to through the first batch out. Well worth the money.