This is a 4-pack of BT-50 Centering Rings for use with an A/B/C Engine Tube (sfr811000). This item is fully Estes compatible.
4 BT-50 Centering Rings for an A/B/C Engine Tube.
Excellent product to replace engines. has everything you nees to rebuild
January 26, 2016
I build my rockets from scratch, and this product works good to make B and C type engine mounts
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