Fits BT-50 & BTH-50 tube

Semroc Centering Ring Plywood BT-50 to BT-55 x 0.25"(1pk) CR-50-55P

Semroc Centering Ring Plywood BT-50 to BT-55 x 0.25"(1pk)  CR-50-55P Laser Cut Lite Plywood&nbs…

Semroc Centering Ring Wound Craft Paper BT-50 to BT-55 Split(1pk) CR-50-55S

Semroc Centering Ring Wound Craft Paper BT-50 to BT-55 Split(1pk)  CR-50-55S 1 pack ID= 0.978" …

Semroc Centering Rings Plywood BT-50 to BT-60(2pk) SEM-RA-50-60P

Semroc Centering Rings Plywood BT-50 to BT-60(2pk)  SEM-RA-50-60P Laser-cut rings for centering…

Semroc Centering Ring Wound Craft Paper BT-20 to BT-50 Slotted(1pk) SEM-AR-2050S

Semroc Centering Ring Wound Craft Paper BT-20 to BT-50 Slotted(1pk)  SEM-AR-2050S Wound Paper r…