Spike Ring

US Size	UK Size	Diameter (mm)	Circumference (mm)
5	J 1/2	15.7 mm	49.3 mm
6	L	16.5 mm	51.9 mm
7	N	17.3 mm	54.4 mm
8	P	18.1 mm	56.9 mm
9	R	18.9 mm	59.4 mm
10	T	19.7 mm	61.9 mm
11	V	20.6 mm	64.4 mm
12	X	21.4 mm	67.0 mm

How to Measure Your Ring Size

Using a String or Paper Strip:

• Wrap a string or paper strip around your finger.
• Mark where the string overlaps.
• Measure the length in millimeters (mm) and use the circumference column to find your size.

Using an Existing Ring:

• Measure the inner diameter of a ring that fits well.
• Use the diameter column to find your size.