Fits ST-11 tube

Semroc Centering Rings Fiber BT-20 to ST-11(2pk) SEM-CR-20-11

Semroc Centering Rings Fiber BT-20 to ST-11(2pk) SEM-CR-20-11 Featherweight laser-cut fiber rings wh…

Semroc Centering Rings Fiber ST-11 to ST-18(2pk) SEM-CR-11-18

Semroc Centering Rings Fiber ST-11 to ST-18(2pk) SEM-CR-11-18 Featherweight laser-cut fiber rings w…

Semroc Centering Rings Fiber BT-20 to ST-11(2 ring set with engine hook slot) SEM-CR-20-11EH

Semroc Centering Rings Fiber BT-20 to ST-11(2 ring set with engine hook slot)   SEM-CR-20-…

Semroc Centering Rings Fiber ST-9 to ST-11(2pk) SEM-CR-9-11

Semroc Centering Rings Fiber ST-9 to ST-11(2pk)  SEM-CR-9-11 Laser-cut rings for centering a ST…

Semroc Centering Rings Fiber ST-7 to ST-11(2pk) SEM-CR-711

Semroc Centering Rings Fiber ST-7 to ST-11(2pk)   SEM-CR-711 Laser-cut rings for centering…

Semroc Centering Rings Fiber ST-5 to ST-11(2pk) SEM-CR-511

Semroc Centering Rings Fiber ST-5 to ST-11(2pk)   SEM-CR-511 Laser-cut rings for centering…