Fits BT-4 tube

Semroc Centering Ring Wound Craft Paper BT-2 to BT-4(1pk) SEM-CR-2-4 *

Semroc Centering Ring Wound Craft Paper BT-2 to BT-4(1pk) SEM-CR-2-4 1 pack ID= 0.281" OD= 0.442" 1/…

Semroc Centering Rings Fiber BT-4 to BT-20(2pk) SEM-RA-4-20*

Semroc Centering Rings Fiber BT-4 to BT-20(2pk)   SEM-RA-4-20 Featherweight laser-cut fibe…

Semroc Centering Rings Fiber BT-4 to BT-50(2pk) RA-4-50 *

Semroc Centering Rings Fiber BT-4 to BT-50(2pk)  RA-4-50 2 pack ID= 0.45" OD= 0.948" 0.05" thic…

Semroc Centering Ring Wound Craft Paper BT-4 to BT-5(1pk) SEM-CR-4-5 *

Semroc Centering Ring  Wound Craft Paper BT-4 to BT-5(1pk) SEM-CR-4-5 1 pack ID= 0.449" OD…

Semroc Centering Ring Wound Craft Paper BT-3 to BT-4(1pk) SEM-CR-3-4 *

Semroc Centering Ring Wound Craft Paper BT-3 to BT-4(1pk)  SEM-CR-3-4 1 pack ID= 0.372" OD= 0.4…

Semroc Centering Rings Fiber BT-2 to BT-4(2pk) RA-2-4 *

Semroc Centering Rings Fiber BT-2 to BT-4(2pk)  RA-2-4 2 pack ID= 0.281" OD= 0.42" 0.05" thick …