Estes Rockets 3175 BT5-BT55 Centering Rings, for Model Rockets, (26P (US IMPORT)
Bt5, Bt20, Bt50 and Bt55. Perfect for making your own engine Mounts! 26 centering rings8 each. Bt5 to Bt20.4 each. Bt5 to Bt50.8 each. Bt20 to Bt50. Bt50 to Bt55. Title: Estes Rockets 3175 BT5-BT55 Centering Rings, for Model Rockets, (26Piece).