8 gauge - 3mm > 3/8" diameter (10mm) > 7/16" diameter (11mm) > 5/8" diameter (16mm) > 3/4" diameter (19mm) > 1" diameter (25mm) > Internal Thread

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8g Stainless Circular Barbell (internal)
8g Stainless Circular Barbell (internal) Circular Barbells 8g - 3/8" diameter (10mm) - 6mm balls Stainless Steel

8g Stainless Circular Barbell (internal)

ICRS-8106
3/8"-1"
$11.98
each
8g Titanium Circular Barbell by Anatometal
00g Titanium Circular Barbell by Anatometal Internal Barbells 00g - 9/16" diameter (14.3mm) Barbell Only (no balls)

8g Titanium Circular Barbell by Anatometal

AL-CRT808BB
5/16"-1"
from $26.60
each