These are externally threaded. Here's the link to internally threaded barbells: https://bodyjewelryfactory.com/bhg100.html
Sorry, but we do not have the 18g 1/4" size.
The barbells can be used anywhere the piercing fits.
Most industrial piercing length is 1 1/4" to 1 1/2" and the bar is either 16 gauge or 14 gauge. Please visit your local piercing shop to measure the exact measurement of your industrial piercing.
The barbell on the far right is 1.5" which is the industrial length 14g. The industrial length is also available in the 16g.
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