A thread gauge is a tool used for identifying the particular thread on a bolt or screw. The gauge will have several blades with saw like teeth of different sizes. You match a particular gauge to the thread which will then tell you what size thread it is. gauges come in various pitches to match different screw threads. UNF, UNC, Whitworth, Metric etc. Each has a different pitch angle and thread per inch or millimetre.
An image of a thread gauge can be seen HERE
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The thickness of 24 gauge steel is 0.0250 inches or 0.635 mm (USG).
4mm sheet metal falls 24 gauge and 25 gauge. 24 gauge sheet metal is 3.175mm (0.125") thick, and 25 gauge sheet metal is 6.35 (0.25") mm thick.
The lower the gauge number, the thicker the steel.
I have always known it as 3 pair as it has 3 pairs of 3 colours. (blue, green and orange)
All things be equal, the 24 ohm will be better. The reason is because they'll be many times louder decibel wise. The 24 ohm headphones can make your eardrums bleed if connected to the right source. 16 ohm (if you can find em) on the other hand will blow your head clean off. If you plug the 63 ohm into most sources you'll probably find the volume level inadequate.