Bis tri's 1" all others are 1.5"----gauge depends on type of sauce--mostly 22 G--winny and suspension 25G. 18G to draw. But why do you need to put it in your bis and tris bro--I use Quads-hips-delts rotations--work just fine for ED injections.
Trev out
Never done biceps but I use 25g for delts/triceps (dont do triceps much anymore). 5/8" should be fine but most of my stuff is 1", I did trim a sheath for 5/8" though.
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