Fits BT-5 & ST-5 tube - 0.541"

Semroc Thrust Block or Engine Block for 13mm Motors Wound Craft Paper(1pk) SEM-TB-5

Semroc Thrust Block or Engine Block for 13mm Motors Wound Craft Paper(1pk)  SEM-TB-5 Wound Craft Pap…

Semroc Centering Ring Plywood ST-5 to ST-7 x 1/4"(1pk) SEM-CR-5-7-1/4P

Semroc Centering Ring Plywood ST-5 to ST-7 x 1/4"(1pk)   SEM-CR-5-7-1/4P Laser cut Plywood to fit an…

Semroc Centering Rings Fiber BT-5 to 40mm(2pk) SEM-CR-5-T40

Semroc Centering Rings Fiber BT-5 to 40mm(2pk)   SEM-CR-5-T40 Laser-cut rings for centering a BT-5(…

Semroc Centering Ring 1/4" Plywood with Engine Hook Slot ST-5 to ST-8(1pk) SEM-CR-5-8EHP

Semroc Centering Ring 1/4" Plywood with Engine Hook Slot ST-5 to ST-8(1pk)   SEM-CR-5-8EHP Plywood r…

Semroc Centering Ring 1/4" Plywood ST-5 to ST-8(1pk) SEM-CR-5-8P

Semroc Centering Ring 1/4" Plywood ST-5 to ST-8(1pk)   SEM-CR-5-8P Plywood ring for centering an ST-…

Semroc Centering Ring Plywood ST-5 to ST-9 x 1/4"(1pk) SEM-CR-5-9-1/4P

Semroc Centering Ring Plywood ST-5 to ST-9 x 1/4"(1pk)   SEM-CR-5-9-1/4P Laser cut Plywood to fit an…

Semroc Centering Ring Plywood ST-5 to ST-9 x 1/4" w/Engine Hook Slot(1pk) SEM-CR-5-9-1/4EHP

Semroc Centering Ring Plywood ST-5 to ST-9(2pk)   SEM-CR-5-9-1/4EHP Laser cut Plywood to fit an ST-5…

Semroc Centering Ring Plywood ST-5 to ST-9 x 1/8"(1pk) SEM-CR-5-9P

Semroc Centering Ring Plywood ST-5 to ST-7(2pk)   SEM-CR-5-7P Laser cut Plywood to fit an ST-5 or BT…

Semroc Centering Ring Plywood ST-5 to ST-7 x 1/8"(2pk) SEM-CR-5-7P

Semroc Centering Ring Plywood ST-5 to ST-7(2pk)   SEM-CR-5-7P Laser cut Plywood to fit an ST-5 tube …

Semroc Centering Ring Plywood BT-50 to BT-55 by 1/8"(1pk) SEM-CR-50-55-1/8P

Semroc Centering Ring Plywood BT-50 to BT-55 by 1/8"(1pk)  SEM-CR-50-55-1/8P Laser Cut Lite Plywood …

Semroc Centering Ring Plywood BT-5 to BT-20 by 1/4"(1pk) SEM-CR-5-20-1/4P

Semroc Centering Ring Plywood BT-5 to BT-20 by 1/4"(1pk) SEM-CR-5-20-1/4P Plywood Ring for centering…

Estes Flying Model Rocket Part Craft Wound Centering Rings Parts Kit EST 3175

Estes Flying Model Rocket Kit Parts Centering Rings 3175 Includes 26 Centering Rings in 5 different …

Semroc Centering Ring Wound Craft Paper Split ST-5 to ST-8(1pk) SEM-CR-58S

Semroc Centering Ring Wound Craft Paper Split ST-5 to ST-8(1pk)   SEM-CR-58S  Wound Craft Paper Ring…

Semroc Plywood Block or Bulkhead for BT-5 tube(2 ring set) SEM-PB-5

Semroc Plywood Bulkhead or Block for BT-5 tube(2 ring set)(same RA-5P) SEM-PB-5P Used as lightweight…

Semroc Centering Rings Fiber ST-5 to ST-7(Set of 2 w/ engine hook slot) SEM-CR-57EH

Semroc Centering Rings Fiber ST-5 to ST-7(Set of 2 w/ engine hook slot)   SEM-CR-57EH Laser-cut fibe…

Semroc Centering Rings Fiber ST-5 to ST-10(2 ring set with engine hook slot) SEM-CR-510EH

Semroc Centering Rings FiberST-5 to ST-10(2 ring set with engine hook slot)   SEM-CR-510EH Laser-cut…

Semroc Centering Rings Fiber BT-5 to BT-60(2pk) SEM-RA-5-60

Semroc Centering Rings Fiber BT-5 to BT-60(2pk)   SEM-RA-5-60 Laser-cut rings for centering a BT-5 t…

Semroc Centering Rings Fiber BT-5 to BT-55(2pk) SEM-RA-5-55

Semroc Centering Rings Fiber BT-5 to BT-55(2pk)   SEM-RA-5-55 Laser-cut rings for centering a BT-5 m…

Semroc Centering Rings Fiber BT-5 to BT-50(2pk) SEM-RA-5-50

Semroc Centering Rings Fiber BT-5 to BT-50(2pk)   SEM-RA-5-50 Laser-cut rings for centering a BT-5 …

Semroc Centering Rings Fiber BT-5 to BT-20(2pk) SEM-RA-5-20

Semroc Centering Rings Fiber BT-5 to BT-20(2pk)  SEM-RA-5-20 Laser-cut rings for centering a BT-5 tu…