Fits ST-13 tube

Semroc Plywood Block or Bulkhead for ST-11 tube(2 ring set) SEM-PB-11

Semroc Plywood Bulkhead or Block for ST-11 tube(2 ring set)  SEM-PB-11P Used as lightweight bul…

Semroc Plywood Block or Bulkhead for ST-9 tube(2 ring set) SEM-PB-9

Semroc Plywood Bulkhead or Block for ST-9 tube(2 ring set)  SEM-PB-9P Used as lightweight bulkh…

Semroc Plywood Block or Bulkhead for ST-8 tube(2 ring set) SEM-PB-8

Semroc Plywood Bulkhead or Block for ST-8 tube(2 ring set)  SEM-PB-8P Used as lightweight bulkh…

Semroc Centering Rings ST-10 to ST-13(2pk) Plywood SEM-CR-10-13P Discontinued

Semroc Centering Rings ST-10 to ST-13(2pk) Plywood SEM-CR-10-13P Laser-cut rings for centering a ST…

Semroc Centering Rings Fiber ST-7 to ST-13(2pk) SEM-CR-713 Discontinued

Semroc Centering Rings Fiber ST-7 to ST-13(2pk)   SEM-CR-713 Laser-cut rings for centerin…

Semroc Centering Rings Fiber ST-5 to ST-13(2pk) SEM-CR-513 Discontinued

Semroc Centering Rings Fiber ST-5 to ST-13(2pk)   SEM-CR-513 Laser-cut rings for centerin…

Semroc Centering Rings Fiber ST-10 to ST-13(2pk) SEM-CR-10-13 Discontinued

Semroc Centering Rings Fiber ST-10 to ST-13(2pk) SEM-CR-10-13 Laser-cut rings for centering a ST-1…