This illustration represents Wire Gauge which is used to measure of thickness in guitar strings and some electrical wire, vintage line drawing or engr Stock Vector Image & Art - Alamy
Wire Gauge, Standard Wire Gauge Measurements 0-36 - Standard & Metric, 1 Tool, Stainless Steel — Beadaholique
Working with Wire - SparkFun Learn
U.S. Standard Wire Gage Measure Ring - WireCare.com