Made from 7075 aluminum (Zicral), one of the toughest available, this gauge lets you instantly adjust the output of your tungsten electrode (also known as a stick-out) in relation to the cup in use. The principle is extremely simple: simply insert the stick-out electrode into the hole corresponding to the cup size, and lock the torch cap. There's no need to do this “by eye” - each hole is perfectly calibrated! Supported cup sizes: 4, 5, 6, 7, 8, 10, 12, 14 & 16 Maximum electrode diameter supported: 3.2mm (1/8") The gauge is supplied with a freely rotating loop, enabling you to hang it on a key-ring.