Conversion chart for body jewelry gauge sizes (ga), gauges, fractional and decimal inches (in), and millimeters (mm). Information on how the gauge system works, what a gauge wheel is, the relationship between radius, diameter, and circumference, how to convert between sizes and measuring systems, and defining tricky measurements like 00ga. We sell organic body piercing jewelry from natural materials like plugs, septums, and labrets in amber, bamboo, horn, bone, stone, wood, and tribal…