"How many cables can I pass through the grommet?"
With the rubber grommet, it is suitable for 6 cables. If you remove the rubber grommet, you can pass through up to 8 cables.
"Is this cable grommet available in another colour?"
Yes, this grommet is also available in glossy chrome.
"Can I pass a VGA or power cable through the rubber grommet?"
No, the rubber grommet is only suitable for cables with smaller connectors. If you do not use the rubber grommet, it is possible to pass through VGA or power cables.