Fits BT-50 & BTH-50 tube

Semroc Centering Rings Plywood BTH-50 to BT-80(2pk) SEM-RA-50H-80P

Semroc Centering Rings Plywood BTH-50 to BT-80(2pk)  RA-50-80P 2 pack ID= 0.992" OD= 2.558" …

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&nb…

Semroc Plywood Block or Bulkhead for BT-58 tube(2 ring set) SEM-PB-58

Semroc Plywood Bulkhead or Block for BT-58 tube(2 ring set) SEM-PB-58P Used as lightweight bulkheads…

Semroc Plywood Block or Bulkhead for BT-20 tube(2 ring set) SEM-PB-20

Semroc Plywood Bulkhead or Block for BT-20 tube(2 ring set) SEM-PB-20P Used as lightweight bulkheads…

Semroc Centering Rings Plywood BT-50 to BT-80(2pk) SEM-RA-50-80P

Semroc Centering Rings Plywood BT-50 to BT-80(2pk)  RA-50-80P Laser Cut Lite Plywood to fit a …

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

Semroc Centering Rings Plywood BTH-50 to BT-60(2pk)  RA-50H-60P 2 pack ID= 0.95" OD= 1.60" …

Semroc Centering Rings Plywood BTH-52(LT-115) to BT-58(2pk) SEM-RA-52H-58P

Semroc Centering Rings Plywood BTH-52(LT-115) to BT-58(2pk)  RA-52H-58Ply Lite Plywood Materia…

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…