I've only had the end mills a couple of weeks but although they cut very well they cut some hardened steels and some softer metals and have performed fairly well. I wish they had a better storage box than the little plastic containers they come in but overall happy with the purchase. They are very sharp and hold their edge well. Have used them at low and high speeds with great success. Be careful with the smaller end mills, they seem to be of decent quality but you still have a chance of breaking them as they are very thin and you have to move slowly when cutting.
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