Semroc Centering Rings Fiber BT-20 to ST-11(2 ring set with engine hook slot) SEM-CR-20-11EH
Laser-cut rings for centering a BT-20 tube inside an ST-11 tube
Thickness= 0.05"
I.D = 0.736
O.D = 1.130
Warranty for 1 year from manufacturer defects
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