2.1 (P) - 1.1 (P) Centering Ring [42211-4]. Rocketarium : Rocketarium Model Rocket Kits, parts and launch supplies

2.1" - 1.1" (54 mm - 29 mm). 1/4" plywood.
Fits into PML 2.1" Phenolic and holds PML 1.1" (29 mm) Phenolic Tube.

- 1.28", - 2.142", 1/4"", 5g