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Model Rocket Engine Hook - G Size. Our "G" hooks are same width and material as our other hooks, but the length and hook section are designed to be used with standard size (4.88"/124mm long) G engines. We recommend the use of the G hooks in pairs (one opposite the other). Our 24/29 Long Centering Rings can be used as a spacer ahead of a standard F engine in a mount using the "G" hook.