Are SCLCR boring bars hardened

I have a Glanze 16mm SCLCR boring bar that I need to shorten and slightly
reduce the diameter at the non-business end so that I can fit it into my
boring head (I couldn't find 5/8" bars anywhere). Before I destroy any
tooling, anyone know if these are hardened? OK, I could try the file test
but I thought I would ask first in case anyone's tried cutting one.
TIA, Martin.
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martin<dot here>whybrow<at here>ntlworld<dot here>com


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