Semroc Centering Rings Fiber ST-7 to BT-58(2pk)(same as CR-KD-6) CR-7-58
Laser-cut fiber rings which center an ST-7 Motor tube inside a BT-58 tube
Especially useful for making a standard engine mount for BT-58 rocket bodies
ID= 0.759"
OD= 1.498"
Thickness: 0.05"