Semroc Centering Rings Fiber ST-7 to ST-9 with Engine Hook Slot(2pk) SEM-CR-7-9EH
laser-cut fiber rings which center a ST-7 motor tube inside a ST-9 tube
Especially useful for making a standard engine mount for ST-9 rocket bodies or adapting a standard engine to a 24mm tube
ID = 0.759"
OD = 0.9"
Thickness = 0.05"
Made in the USA