Semroc Centering Ring Set Fiber LT-115(BTH-52) to ST-18(2 Piece Set with Engine Hook Slot) SEM-CR-115-18EH
Laser-cut fiber rings which center an LT-115(BTH-52) motor tube inside an ST-18 tube
Especially Useful for Making a 29mm Motor Mount for ST-18 Rocket Bodies
Thickness is 0.05"
ID= 1.21"
OD= 1.8"
Made in the USA