I had some spring steel recently (HRC up to 63 according to wikipedia) and it ate my HSS cutters - 3 in fact.

So I was thinking I'd buy a carbide end mill set to cut harder materials. Anyone have a good source, like on ebay for a set? I found a few single ones but they stated they'd cut up to HRC 45 which seems too low, e.g. https://www.ebay.com.au/itm/12mm-dia...8AAOSw0GJZpNh-

Are these any good? https://www.ebay.com.au/itm/5Pcs-Tun...AAAOSwvYZZmqs5

Cheers


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