Fits BT-58 tube

Semroc Centering Rings Fiber BT-20 to BT-60(2 ring set with engine hook slot) SEM-RA-20-60E

Semroc Centering Rings Fiber BT-20 to BT-60(2 ring set with engine hook slot)   SEM-RA-20-…

Semroc Centering Rings Fiber ST-8 to BT-58(2pk) SEM-CR-8-58

Semroc Centering Rings Fiber ST-8 to BT-58(2pk) SEM-CR-8-58 Laser-cut fiber rings which center an ST…

Semroc Centering Rings Plywood BT-50 to BT-58(2pk) SEM-RA-50-58P

Semroc Centering Rings Plywood BT-50 to BT-58(2pk)  RA-50-58Ply Laser Cut Lite Plywood Rings to…

Semroc Centering Rings Fiber BT-50 to BT-58(2pk) SEM-RA-50-58

Semroc Centering Rings Fiber BT-50 to BT-58(2pk)  RA-50-58 Laser Cut Fiber Rings to Center a B…

Semroc Centering Rings Fiber BT-58 to BT-80(2pk) SEM-RA-58-80

Semroc Centering Rings Fiber BT-58 to BT-80(2pk)   SEM-RA-58-80 Featherweight laser-cut f…

Semroc Centering Rings Fiber BT-55 to BT-58(2pk) SEM-RA-55-58

Semroc Centering Rings Fiber BT-55 to BT-58(2pk)   SEM-RA-55-58 Featherweight laser-cut f…

Semroc Centering Rings Fiber BT-20 to BT-58(2pk) SEM-RA-20-58

Semroc Centering Rings Fiber BT-20 to BT-58(2pk)   SEM-RA-20-58 Laser-cut rings for center…