I kept them in a plastic tool box in the garage and out of the rain only in Houston, Texas when the humidity was high, they began to rust rust. They work well with some work to smooth out the ends. The screws I had to use them on have a flat part of the bit, so I flattened the ends of the bits on the stone to use the full length of the bit for screwing. I now store these bits in a plastic bag with silicone spray on them to stop rusting. For the price these bits are ok with a hand screwdriver. I don't know how to use bits in a drill or impact driver.
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