1/2" diameter (13mm)

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4g Spring-Loaded Captive Bead Ring
4g Spring-Loaded Captive Bead Ring Captive Bead Rings 4g (5mm) - 1/2" dia (13mm) - 8mm ball Stainless Steel

4g Spring-Loaded Captive Bead Ring

1/2"-5/8"
$9.98
each
4g Stainless Circular Barbell (internal)
4g Stainless Circular Barbell (internal) Circular Barbells 4g - 15/32" diameter (12mm) - 8mm balls Stainless Steel

4g Stainless Circular Barbell (internal)

15/32"-1"
$11.98
each
4g Snap-fit Captive Bead Ring
4g Snap-fit Captive Bead Ring Captive Bead Rings 4g (5mm) - 15/32" dia (12mm) - 8mm ball Stainless Steel

4g Snap-fit Captive Bead Ring

15/32"-1"
$8.98
each
4g Black Circular Barbell (internal)
4g Black Circular Barbell (internal) Circular Barbells 4g - 1/2" diameter (13mm) - 8mm balls Black

4g Black Circular Barbell (internal)

1/2"-3/4"
$12.98
each
4g Titanium Circular Barbell by Anatometal
2g Titanium Circular Barbell by Anatometal Circular Barbells 2g - 7/16" diameter (11.1mm) Barbell Only (no balls)

4g Titanium Circular Barbell by Anatometal

3/8"-1"
From $80.60
each