The conversion chart will indicate the size of the ring from Italian size (same used in France, Switzerland and Spain) to the UK size (used also in Australia), to the USA and Canada size and indicates the diameter of the ring in mm which corrisponds to the German and North European size.
The adjustable rings are easy to bend by yourself to any size between the Italian 12 size to a maximum 20 Italian size. We can send you the adjustable ring already set to your size, if that is your preference, just write us at info@ajtuscany.com.