Fits BT-50 & BTH-50 tube

Semroc Centering Rings Fiber BT-4 to BT-50(2pk) SEM-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 Rings Fiber BT-50 to BT-55(2pk) SEM-RA-50-55

Semroc Centering Rings Fiber BT-50 to BT-55(2pk)  RA-50-55  Laser Cut Fiber Rings to fit a…