There’s a circular thread that fits all the default handlebars. You need to find the right spot and fix it. It’s easy and the best in the segment.
How good is the knob quality, does it hold the phone in grip or does it gets loose due to vibration and chances of the phone falling off?
The overall quality of the product is superb. I am using it. Knob quality is also better than any product available on market. Yes! It holds your mobile nicely. You can go for this product without fear.
Is this mirror mount metal body or plastic body?
Both combination plastic and metal
Does the holder make any vibration noise?
No, the holder doesn’t make any noise at all.