Semroc Centering Ring Wound Craft Paper BT-20 to BT-50-1/4"(1pk)(same AR-2050) SEM-CR-20-50-1/4
Functions as an Engine Block for a BT-50 Tube(EB-50)
1 pack
ID= 0.738"
OD= 0.948"
1/4" thick wound craft construction
Made in the USA
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