First of all, it's great value for money! Certainly better than many of the regular blades I've bought for my rotary tool in the past. That being said, they're versatile, so don't expect high quality from well-known brands. Resin blades cut well, but they don't appear to be fiberglass reinforced and therefore wear out a bit quicker than the product they look like most. They are sturdy though - I haven't had a single break yet. Mine came in a small zipped bag for easy storage. Metal blades were a new experience for me. They worked well with wood but I don't think I would use them with aluminum or anything like that. Note the direction of rotation - my Dremel has the printed side facing the tool. Also check your mandrel before use, mine had a small burr that unbalanced the blade at first and I thought my tool was messed up. They came in a box with each in a separate sealed bag that you have to ruin to open them. It's okay, at least they're protected from each other. I haven't used diamond blades but they seem to be on par with competing products. Someday I will need them. but it's not that day. Mine were individually sealed, as were the metal blades. I suspect they can hurt each other if left together in a small bag. Overall I'm very happy with this purchase and will buy again if it's still available if I need more blades. People always say you get what you pay for, but in this case you get more.
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