Width is approximately 8mm. 316L is the highest grade of stainless steel used in the jewelry market. It is so good at resisting fade, rust, and corrosion, that it is used in architecture as well as in marine environments. A great masonic jewelry gift! At the same time, it is safe to use for medical purposes inside the body. It will not fade, change color, or leave stains on your body. It doesn't even require any maintenance to keep it looking new.