Discontinued Steel Screw Fit Compass Eyelet
4g eyelets have a 12mm front flares
2g eyelets have a 13mm front flares
0g eyelets have a 15mm front flares
00g eyelets have a 17mm front flares
7/16" eyelets have a 18mm front flares
1/2" eyelets have a 20mm front flares
9/16" eyelets have a 20.5mm front flares
5/8" eyelets have a 22.5mm front flares
All sizes have an approximate 1/4" wearable.
Jewelry is measured through a gauge system (see chart below). The higher the gauge number the smaller the wire is. A standard "earring" is usually 20 gauge. Jewelry gauges/sizes can vary between manufacturers. There is no universal regulation on companies to make a standard size in body jewelry. A big part of this is that some jewelry is made overseas and measured in millimeters. And in the USA jewelry is measured in inches/gauges. So many times jewelry can be anywhere from .5mm to 1mm different.