Semroc Centering Rings Fiber BT-20 to 35mm(2pk) SEM-CR-20-T35
Featherweight laser-cut fiber rings which center a BT-20 tube inside a Metric 35mm tube
Especially useful for making an engine mount for Metric 35mm rocket bodies
Requires two per engine mount
I.D = 0.736
O.D = 1.377
Thickness: 0.05