4.0 - 2.2 (P) Centering Ring
4.0" - 2.2" (4" - 54 mm) centering ring holds 54mm motor tube inside 4" airframe. 1/4" plywood.
Fits into any 4" airframe. Works best with PML and GLR phenolic, Hawk Mt and Performance Rocketry fiberglass 54mm motor tube.