#12 = 3/4" (19.05mm) Gas Orifice x 1" (25.4mm) Long x 3/32" (2.4mm) Electrode Diameter.
If you're welding exotic materials such as Titanium, Inconel, Hastelloy, Monel, Stainless Steel, Chromoly, Docol R8, etc., then these cups may be exactly what you need to improve gas coverage, arc stability, tungsten stick-out, and visibility.
Designed for Argon flow rates between 15-30 CFH (cubic feet hour).
Do Not Exceed 175 amps for extended periods of time.