Add material in toolbox

Hi all,

I'm using the toolbox setting, I have created a library for us SHCS, but i have 2 identical SHCS in metric, but it's not the same material

-SHCS M08 X 1.25 X 030MM SS

-SHCS M08 X 1.25 X 030MM AS

I have try to export my library in excel and modify in the excel files :

But when I import it in the library, the length doesn't change :

How can I manage that?

Thanks in advance for your help,

VK

SolidworksToolbox