3/8" diameter (10mm) > Internal Thread

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

16g Titanium Circular Barbell by Anatometal

AL-CRT1606BB
1/4"-1/2"
from $16.86
each
12g Circular Barbell by Body Circle Designs
Sale
12g Circular Barbell by Body Circle Designs Circular Barbells 12g - 5/16" diameter - 5/32" balls Stainless Steel

12g Circular Barbell by Body Circle Designs

BCDCRS-1208
1/4"-1"
$28.98
$21.74
each
14g Planetary Circular Barbell
14g Planetary Circular Barbell Circular Barbells 14g - 3/8" diameter (10mm) Stainless Steel

14g Planetary Circular Barbell

CR200
3/8"
$14.98
each
14g Titanium Circular Barbell (internal, no ends)
14g Titanium Circular Barbell (internal, no ends) Internal Barbells 14g - 1/4" diameter (6mm) High Polish (silver)

14g Titanium Circular Barbell (internal, no ends)

ICRT-1406BB
1/4"-9/16"
$4.98
each
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
10g Black Circular Barbell (internal)
12g Black Circular Barbell (internal) Circular Barbells 12 gauge - 1/2" diameter (13mm) Black Stainless

10g Black Circular Barbell (internal)

ICRB-10106
3/8"-1/2"
$7.98
each
12g Titanium Circular Barbell by Anatometal
00g Titanium Circular Barbell by Anatometal Internal Barbells 00g - 9/16" diameter (14.3mm) Barbell Only (no balls)

12g Titanium Circular Barbell by Anatometal

AL-CRT1208BB
5/16"-1"
from $20.96
each
14g Stainless Circular Barbell by Body Circle Designs
Sale
14g Stainless Circular Barbell by Body Circle Designs Circular Barbells 14g - 1/4" diameter Stainless Steel

14g Stainless Circular Barbell by Body Circle Designs

BCDCRS-1406
1/4"-1"
$28.98
$21.74
each
10g Circular Barbell by Body Circle Designs
Sale
10g Circular Barbell by Body Circle Designs Circular Barbells 10g - 5/16" diameter - 3/16" balls Stainless Steel

10g Circular Barbell by Body Circle Designs

BCDCRS-1008
Closeout!
$33.48
$25.11
each
14g Titanium Circular Barbell by Anatometal
00g Titanium Circular Barbell by Anatometal Internal Barbells 00g - 9/16" diameter (14.3mm) Barbell Only (no balls)

14g Titanium Circular Barbell by Anatometal

AL-CRT1408BB
5/16"-5/8"
from $18.90
each
16g Black Titanium Circular Barbell (internal)
16g Black Titanium Circular Barbell (internal) Circular Barbells 16g - 5/16" diameter (8mm) - 3mm balls Black Titanium

16g Black Titanium Circular Barbell (internal)

ICRT-BK-16083
5/16-3/8"
$8.98
each
16g Gold Titanium Circular Barbell (internal)
16g Gold Titanium Circular Barbell (internal) Circular Barbells 16g - 5/16" diameter (8mm) - 3mm balls Gold Titanium

16g Gold Titanium Circular Barbell (internal)

ICRT-GD-16083
5/16-3/8"
$8.98
each
16g Titanium Twister Barbell by Anatometal
16g Titanium Twister Barbell by Anatometal Internal Barbells 16g - 5/16" diameter (8.0mm) Barbell Only (no balls)

16g Titanium Twister Barbell by Anatometal

AL-TWT1608BB
5/16"-3/8"
from $26.02
each