Widget width options


I would like to show 6 text widget on the same column, so I need to change the widget width on the stling section, but the options are only: full, 1/2, 1/3. There is no option to 1/6 or any others.
And it happen the same with images and more sections. Any suggestion?
Thank you in advance.

Hello there,

Do you use additional plugin? Is there any link to download that allows me to try it on my test site?