4 gauge ~ 5mm > 5/8" diameter (16mm)

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4g Titanium Circular Barbell by Anatometal
00g Titanium Circular Barbell by Anatometal Internal Barbells 00g - 9/16" diameter (14.3mm) Barbell Only (no balls)

4g Titanium Circular Barbell by Anatometal

AL-CRT410BB
3/8"-1"
from $80.60
each
4g Rainbow Circular Barbell
4g Rainbow Circular Barbell Circular Barbells 4g - 15/32" diameter (12mm) - 8mm balls Rainbow Stainless

4g Rainbow Circular Barbell

CRA-412-RN
15/32"-5/8"
$9.98
each
4g Spring-Loaded Black Captive Bead Ring
2g Spring-Loaded Black Captive Bead Ring Spring-Bead Rings 2g (6mm) - 15/32" dia (12mm) - 10mm ball Black Stainless

4g Spring-Loaded Black Captive Bead Ring

CBKPOP-412
15/32"-5/8"
$13.98
each