Small / Medium Size Ring Guards
The Small (18 X 2 mm) /MEDIUM (20 x 2 mm) Sized Ring Guard is ideal for a typical women's ring. The arms are about 6 mm's long which would fit a ring band of about 2 mm to 3 mm thickness.
For Large/ Thicker banded Ring
The Large ( 21 x 2 mm )Sized Ring Guard is ideal for a ring with a thicker band. The arms are about 11 mm's long which would fit a ring band of about 4 mm to 6 mm thickness.