6mm obvious
The size of a small ball bearing.
A 9 mm kidney stone is considered a large kidney stone. It may be difficult to pass naturally and may require medical intervention such as lithotripsy or surgical removal.
It certainly wouldn't be a small one.
7 mm is about a quarter inch and 3 mm about an eighth of an inch.
3 mm is about an eighth of an inch; 7 mm is a bit more than a quarter inch.
6mm is a quarter inch.
144 cubic millimeters
10 mm
6 millimeters = .2 inches Direct Conversion Formula 6 mm* 1 in 25.4 mm = 0.2362204724 in
normal kidney measurements
milimeters
9 millimeters